doc: Add badges to README.md

[ccarpita]

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[codecov-commenter]

Codecov Report

Merging #6 (985eba4) into main (38594f3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #6   +/-   ##
=======================================
  Coverage   96.13%   96.13%           
=======================================
  Files          17       17           
  Lines         569      569           
=======================================
  Hits          547      547           
  Misses         22       22           

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