Test coverate info

[snk4tr]

Closes #84

Proposed Changes

• Add test coverage info to the testing CI pipeline
• Integration with codecov via GitHub Actions
• Display of coverage info with a badge in the README

[snk4tr]

@denproc @zakajd ready for review

[denproc]

Nice job, some changes should take place though.

[denproc]

@snk4tr We have to install Codecov app into our repo or add Codecov bot to obtain comment like sonarcloud one.
The bot can be added only by the owner of the organisation. I assume the same applies in case of app installation.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@28eb117). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #116   +/-   ##
=========================================
  Coverage          ?   87.76%           
=========================================
  Files             ?       15           
  Lines             ?     1275           
  Branches          ?        0           
=========================================
  Hits              ?     1119           
  Misses            ?      156           
  Partials          ?        0           

Flag	Coverage Δ
#unittests	87.76% <0.00%> (?)

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
No Duplication information