docs: adding badges to README

[holtgrewe]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (56f7078) 49.34% compared to head (6b3f959) 50.00%.
Report is 3 commits behind head on main.

❗ Current head 6b3f959 differs from pull request most recent head d0c021e. Consider uploading reports for the commit d0c021e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   49.34%   50.00%   +0.65%     
==========================================
  Files          14       13       -1     
  Lines        1147     1144       -3     
==========================================
+ Hits          566      572       +6     
+ Misses        581      572       -9     

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