Add linting and tool config files

.browserslistrc

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+# https://github.com/browserslist/browserslist#config-file
+> 1%
+last 2 versions
+ie 11
+not ie 10

.editorconfig

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+# http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+max_line_length = 80
+trim_trailing_whitespace = true
+
+[COMMIT_EDITMSG]
+max_line_length = 0

.eslintrc

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+extends:
+  - 'eslint:recommended'
+  - prettier
+parser: babel-eslint
+plugins:
+  - prettier
+parserOptions:
+  sourceType: module
+  ecmaVersion: 2018
+  ecmaFeatures:
+    experimentalObjectRestSpread: true
+env:
+  browser: true
+  es6: true
+  node: true
+rules:
+  no-console: 0
+  prettier/prettier:
+    - error

.rubocop.yml

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+# Modified from https://raw.githubusercontent.com/rubocop-hq/rubocop/master/.rubocop.yml
+
+require:
+  - rubocop/cop/internal_affairs
+  - rubocop-rspec
+
+AllCops:
+  Exclude:
+    - 'vendor/**/*'
+    - 'spec/fixtures/**/*'
+    - 'tmp/**/*'
+  TargetRubyVersion: 2.5.1
+
+Layout/EndOfLine:
+  EnforcedStyle: lf
+
+Layout/ClassStructure:
+  Enabled: true
+  Categories:
+    module_inclusion:
+      - include
+      - prepend
+      - extend
+  ExpectedOrder:
+    - module_inclusion
+    - constants
+    - public_class_methods
+    - initializer
+    - instance_methods
+    - protected_methods
+    - private_methods
+
+Metrics/BlockLength:
+  Enabled: false
+
+Metrics/ClassLength:
+  Enabled: false
+
+Metrics/MethodLength:
+  Enabled: false
+
+Metrics/ModuleLength:
+  Enabled: false
+
+Rails:
+  Enabled: true
+
+RSpec/ExampleLength:
+  Enabled: false
+
+RSpec/MultipleExpectations:
+  Enabled: false
+
+Style/Documentation:
+  Enabled: false
+
+Style/FrozenStringLiteralComment:
+  Enabled: false

.stylelintrc

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+{
+enabled: true,
+extends: [
+"stylelint-config-recommended-scss",
+"./node_modules/prettier-stylelint/config.js"
+],
+plugins: [
+"stylelint-order",
+"stylelint-scss"
+],
+rules: {
+block-no-empty: null,
+block-opening-brace-newline-after: "always-multi-line",
+block-closing-brace-newline-before: "always-multi-line",
+declaration-block-single-line-max-declarations: 1,
+order/order: [
+"custom-properties",
+"declarations"
+],
+order/properties-alphabetical-order: true
+}
+}

.tool-versions

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+nodejs 8.12.0
+ruby 2.5.3