nit: add badges on readme

[gsabran]

Summary

Add badges on readme

Checklist before merging

• If this is a new feature or a bug fix, I have added tests.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.91%. Comparing base (e432c6b) to head (b92b81e).
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   62.80%   62.91%   +0.10%     
==========================================
  Files          14       14              
  Lines         941      941              
==========================================
+ Hits          591      592       +1     
+ Misses        350      349       -1     

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