add code coverage github action

[sashabaranov]

As mentioned in #32

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@c380d50). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head b526476 differs from pull request most recent head b04e550. Consider uploading reports for the commit b04e550 to get more accurate results

@@            Coverage Diff            @@
##             master     #134   +/-   ##
=========================================
  Coverage          ?   36.04%           
=========================================
  Files             ?       16           
  Lines             ?      516           
  Branches          ?        0           
=========================================
  Hits              ?      186           
  Misses            ?      289           
  Partials          ?       41           

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