Add readme badges and ignore test cover data

[alesr]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.52%. Comparing base (d22bcd2) to head (611f00d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
+ Coverage   83.33%   84.52%   +1.19%     
==========================================
  Files           4        4              
  Lines         168      168              
==========================================
+ Hits          140      142       +2     
+ Misses         17       16       -1     
+ Partials       11       10       -1     

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