Added github action to lint markdown files. Addresses #55

.github/workflows/markdown_linter.yml

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+name: Linting Markdown files
+on:
+    push:
+    pull_request:
+
+jobs:
+    update-contributors:
+        runs-on: ubuntu-latest
+        steps:
+        - name: Checkout repository
+          uses: actions/checkout@v4
+          with:
+            fetch-depth: 0
+        - name: Setup Python3.11
+          uses: actions/setup-python@v4
+          with:
+            python-version: 3.11
+
+
+        - name: Installing GitHub CLI
+          run: |
+           sudo apt install -y gh jq nodejs npm        
+
+        - name: Installing python packages
+          run: |
+             python -m pip install --upgrade pip
+             pip install -r .github/workflows/markdown_linter/requirements.txt       
+    
+        - name: Installing Markdown Linter
+          run: |
+              sudo npm install -g markdownlint-cli
+
+        - name: Markdown linting job has been triggered
+          run: |
+            echo "The job was automatically triggered by a ${{ github.event_name }} event."
+        - name: Running markdown linter
+          run: |
+              markdownlint --config .github/workflows/markdown_linter/.markdownlint.yml --ignore-file .github/workflows/markdown_linter/mdlintignore.yml 
+              ret=$?
+              if [ $ret -eq 1 ]; then
+                echo "Linting failed. Please correct any errors and run the job again."
+                exit 1
+              fi

.github/workflows/markdown_linter/.mdlintconfig.yml

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+# Example markdownlint configuration with all properties set to their default value
+
+# Default state for all rules
+default: true
+
+# Path to configuration file to extend
+extends: null
+
+# MD001/heading-increment : Heading levels should only increment by one level at a time : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md001.md
+MD001: true
+
+# MD003/heading-style : Heading style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md003.md
+MD003:
+  # Heading style
+  style: "consistent"
+
+# MD004/ul-style : Unordered list style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md004.md
+MD004:
+  # List style
+  style: "consistent"
+
+# MD005/list-indent : Inconsistent indentation for list items at the same level : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md005.md
+MD005: true
+
+# MD007/ul-indent : Unordered list indentation : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md007.md
+MD007:
+  # Spaces for indent
+  indent: 4
+  # Whether to indent the first level of the list
+  start_indented: false
+  # Spaces for first level indent (when start_indented is set)
+  start_indent: 4
+
+# MD009/no-trailing-spaces : Trailing spaces : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md009.md
+MD009:
+  # Spaces for line break
+  br_spaces: 2
+  # Allow spaces for empty lines in list items
+  list_item_empty_lines: false
+  # Include unnecessary breaks
+  strict: false
+
+# MD010/no-hard-tabs : Hard tabs : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md010.md
+MD010:
+  # Include code blocks
+  code_blocks: true
+  # Fenced code languages to ignore
+  ignore_code_languages: []
+  # Number of spaces for each hard tab
+  spaces_per_tab: 4
+
+# MD011/no-reversed-links : Reversed link syntax : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md011.md
+MD011: true
+
+# MD012/no-multiple-blanks : Multiple consecutive blank lines : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md012.md
+MD012:
+  # Consecutive blank lines
+  maximum: 1
+
+# MD013/line-length : Line length : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md013.md
+MD013:
+  # Number of characters
+  line_length: 80
+  # Number of characters for headings
+  heading_line_length: 80
+  # Number of characters for code blocks
+  code_block_line_length: 80
+  # Include code blocks
+  code_blocks: true
+  # Include tables
+  tables: true
+  # Include headings
+  headings: true
+  # Strict length checking
+  strict: false
+  # Stern length checking
+  stern: false
+
+# MD014/commands-show-output : Dollar signs used before commands without showing output : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md014.md
+MD014: true
+
+# MD018/no-missing-space-atx : No space after hash on atx style heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md018.md
+MD018: true
+
+# MD019/no-multiple-space-atx : Multiple spaces after hash on atx style heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md019.md
+MD019: true
+
+# MD020/no-missing-space-closed-atx : No space inside hashes on closed atx style heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md020.md
+MD020: true
+
+# MD021/no-multiple-space-closed-atx : Multiple spaces inside hashes on closed atx style heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md021.md
+MD021: true
+
+# MD022/blanks-around-headings : Headings should be surrounded by blank lines : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md022.md
+MD022:
+  # Blank lines above heading
+  lines_above: 1
+  # Blank lines below heading
+  lines_below: 1
+
+# MD023/heading-start-left : Headings must start at the beginning of the line : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md023.md
+MD023: true
+
+# MD024/no-duplicate-heading : Multiple headings with the same content : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md024.md
+MD024:
+  # Only check sibling headings
+  allow_different_nesting: true
+  # Only check sibling headings
+  siblings_only: false
+
+# MD025/single-title/single-h1 : Multiple top-level headings in the same document : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md025.md
+MD025:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD026/no-trailing-punctuation : Trailing punctuation in heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md026.md
+MD026:
+  # Punctuation characters
+  punctuation: ".,;:!。，；：！"
+
+# MD027/no-multiple-space-blockquote : Multiple spaces after blockquote symbol : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md027.md
+MD027: true
+
+# MD028/no-blanks-blockquote : Blank line inside blockquote : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md028.md
+MD028: true
+
+# MD029/ol-prefix : Ordered list item prefix : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md029.md
+MD029:
+  # List style
+  style: "one_or_ordered"
+
+# MD030/list-marker-space : Spaces after list markers : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md030.md
+MD030:
+  # Spaces for single-line unordered list items
+  ul_single: 1
+  # Spaces for single-line ordered list items
+  ol_single: 1
+  # Spaces for multi-line unordered list items
+  ul_multi: 1
+  # Spaces for multi-line ordered list items
+  ol_multi: 1
+
+# MD031/blanks-around-fences : Fenced code blocks should be surrounded by blank lines : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md031.md
+MD031:
+  # Include list items
+  list_items: true
+
+# MD032/blanks-around-lists : Lists should be surrounded by blank lines : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md032.md
+MD032: true
+
+# MD033/no-inline-html : Inline HTML : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md033.md
+# MD033:
+  # Allowed elements
+  # allowed_elements: []
+
+# MD034/no-bare-urls : Bare URL used : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md034.md
+MD034: true
+
+# MD035/hr-style : Horizontal rule style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md035.md
+MD035:
+  # Horizontal rule style
+  style: "consistent"
+
+# MD036/no-emphasis-as-heading : Emphasis used instead of a heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md036.md
+MD036:
+  # Punctuation characters
+  punctuation: ".,;:!?。，；：！？"
+
+# MD037/no-space-in-emphasis : Spaces inside emphasis markers : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md037.md
+MD037: true
+
+# MD038/no-space-in-code : Spaces inside code span elements : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md038.md
+MD038: true
+
+# MD039/no-space-in-links : Spaces inside link text : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md039.md
+MD039: true
+
+# MD040/fenced-code-language : Fenced code blocks should have a language specified : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md040.md
+MD040:
+  # List of languages
+  allowed_languages: []
+  # Require language only
+  language_only: false
+
+# MD041/first-line-heading/first-line-h1 : First line in a file should be a top-level heading : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md041.md
+MD041:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD042/no-empty-links : No empty links : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md042.md
+MD042: true
+
+# MD043/required-headings : Required heading structure : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md043.md
+MD043:
+  # List of headings
+  headings: []
+  # Match case of headings
+  match_case: false
+
+# MD044/proper-names : Proper names should have the correct capitalization : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md044.md
+MD044:
+  # List of proper names
+  names: []
+  # Include code blocks
+  code_blocks: true
+  # Include HTML elements
+  html_elements: true
+
+# MD045/no-alt-text : Images should have alternate text (alt text) : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md045.md
+MD045: true
+
+# MD046/code-block-style : Code block style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md046.md
+MD046:
+  # Block style
+  style: "consistent"
+
+# MD047/single-trailing-newline : Files should end with a single newline character : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md047.md
+MD047: true
+
+# MD048/code-fence-style : Code fence style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md048.md
+MD048:
+  # Code fence style
+  style: "consistent"
+
+# MD049/emphasis-style : Emphasis style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md049.md
+MD049:
+  # Emphasis style
+  style: "consistent"
+
+# MD050/strong-style : Strong style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md050.md
+MD050:
+  # Strong style
+  style: "consistent"
+
+# MD051/link-fragments : Link fragments should be valid : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md051.md
+MD051: true
+
+# MD052/reference-links-images : Reference links and images should use a label that is defined : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md052.md
+MD052:
+  # Include shortcut syntax
+  shortcut_syntax: false
+
+# MD053/link-image-reference-definitions : Link and image reference definitions should be needed : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md053.md
+MD053:
+  # Ignored definitions
+  ignored_definitions:
+    - "//"
+
+# MD054/link-image-style : Link and image style : https://github.com/DavidAnson/markdownlint/blob/v0.32.1/doc/md054.md
+MD054:
+  # Allow autolinks
+  autolink: true
+  # Allow inline links and images
+  inline: true
+  # Allow full reference links and images
+  full: true
+  # Allow collapsed reference links and images
+  collapsed: true
+  # Allow shortcut reference links and images
+  shortcut: true
+  # Allow URLs as inline links
+  url_inline: true

.github/workflows/markdown_linter/.mdlintignore

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+_book/*
+.github
+.quarto
+*.yml
+*.html
+*.png
+*.json