feat(#48): mdlint

[h1alexbel]

closes #48

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PR-Codex overview

This PR updates the GitHub Actions workflow file markdown-lint.yml to include licensing information and configure markdown linting for the repository.

Detailed summary

• Added MIT License information
• Defined GitHub Actions workflow for markdown linting
• Set up linting for the master branch
• Specified concurrency and cancellation settings
• Configured job to run on ubuntu-22.04 environment

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.33%. Comparing base (671c79a) to head (e02c5b7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   53.33%   53.33%           
=======================================
  Files           4        4           
  Lines          15       15           
=======================================
  Hits            8        8           
  Misses          7        7           

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[h1alexbel]

@rultor merge

[rultor]

@rultor merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@h1alexbel Done! FYI, the full log is here (took me 9min)