Add codecov

[brunoocasali]

Fixes #273

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@4b77938). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 35c98a8 differs from pull request most recent head 1780d31. Consider uploading reports for the commit 1780d31 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #274   +/-   ##
=======================================
  Coverage        ?   88.81%           
=======================================
  Files           ?       10           
  Lines           ?      644           
  Branches        ?        0           
=======================================
  Hits            ?      572           
  Misses          ?       72           
  Partials        ?        0           

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