Add code coverage

[utybo]

Fixes #18

⚠️ Inaccurate atm because not all projects even have tests, which makes them not included in the total calculation

• Update changelog
• Update documentation (add details on what the tegral block returns)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@33037de). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage        ?   85.64%           
  Complexity      ?      164           
=======================================
  Files           ?       64           
  Lines           ?     1045           
  Branches        ?       74           
=======================================
  Hits            ?      895           
  Misses          ?      117           
  Partials        ?       33           

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[github-actions]

This pull request has been deployed to Vercel.

Latest commit:	61fdd24
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