chore: use copyrights-action

[h1alexbel]

copyrights-action integration

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PR-Codex overview

This PR updates the repository's licensing information and adds a workflow to manage copyrights.

Detailed summary

• Updated licensing information to MIT License with copyright notice
• Added a workflow (copyrights.yml) to manage copyrights
• Workflow triggers on push and pull request events
• Uses yegor256/[email protected] for copyright management

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 22.58%. Comparing base (c0e8801) to head (d00b74d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   22.58%   22.58%           
=======================================
  Files           3        3           
  Lines          31       31           
=======================================
  Hits            7        7           
  Misses         24       24           

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