Few maintanence changes to improve readme and code quality

[Czaki]

• Improve messages in the readme
• Add linting action
• setup code coverage reports

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@1e32144). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #1   +/-   ##
=======================================
  Coverage        ?   98.98%           
=======================================
  Files           ?        3           
  Lines           ?       99           
  Branches        ?       28           
=======================================
  Hits            ?       98           
  Misses          ?        0           
  Partials        ?        1           

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