Feature - Add GitHub Action to add contributors to README

[christianwwwwwwww]

When a user submits a new issue, the bot first checks to see whether it is a request to be added as a contributor. If not, it quickly exits. The user will need to format the name of their request properly "Add XXXXX to contributors" in order for the action to run.

The GitHub Action ensures that:

• the person opening the issue requests that their own name be added to the README.
• there is a link to a GitHub repo in the issue body
• the user has starred the Leo repo
• the user is the author of the linked repo
• the linked repo contains a valid Leo application (by checking for presence of a main.leo file)

Then, the GitHub action:

• creates a properly formatted PR to insert the user along with the requested badge and emoji into the README
• increments the Contributor Count section of the README.
• tags the techops team to review that PR
• comments on the issue and tags the user if there are errors with their request

Note: - For the GitHub action to be able to create PRs, we must ensure that the “Allow Github actions to create and approve pull requests” box is checked in the Leo repo under Settings -> Actions.

(cc @aharshbe )

[codecov]

Codecov Report

Merging #3824 (ba03b39) into testnet3 (4c0dda4) will increase coverage by 0.04%.
Report is 3 commits behind head on testnet3.
The diff coverage is n/a.

❗ Current head ba03b39 differs from pull request most recent head 472ddbd. Consider uploading reports for the commit 472ddbd to get more accurate results

@@             Coverage Diff              @@
##           testnet3    #3824      +/-   ##
============================================
+ Coverage     79.24%   79.28%   +0.04%     
============================================
  Files           172      172              
  Lines          5791     5798       +7     
  Branches       5791     5798       +7     
============================================
+ Hits           4589     4597       +8     
+ Misses         1202     1201       -1     

see 4 files with indirect coverage changes

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[ghost]

This looks good. We worked on this next to each other in the office (fodder for others). Everything works as planned. There is a slight thing where the validate_and_add_contributor action is run despite the issue created but the first check remediates that. This is a limitation of GitHub and does not currently negatively impact anything other than a few seconds of time to check per issue.

[ghost]

@collinc97, when you have a moment, we need to check if the GitHub Actions interface/bot(s) have the ability to approve pull requests which can be determined by whether the “Allow Github actions to create and approve pull requests” box is checked as @christianwooddell indicated which you can locate via Settings -> Actions. Please let me know if you have any further questions or concerns.

If the box is checked, the bot should be ready and will work as expected. If not, please check that box.

Should you like to test out @christianwooddell's bot, you can do so via his instance of it here. @christianwooddell has added you to his repo; you should see an invite via email shortly.

[MarkStepa]

@christianwwwwwwww @aharshbe pls check my message #4679 (comment)
I think you are missing little thing