GitHub tests

[northwestwitch]

This PR adds | fixes:

• Adds a GitHub action to run pytest and upload eventual coverage to Codecov (fix #9)

How to test:

• GitHub actions

Review:

• [ ] Code approved by
• [x] Tests executed by GitHub actions

This version is a:

• [ ] MAJOR - when you make incompatible API changes
• [x] MINOR - when you add functionality in a backwards compatible manner
• [ ] PATCH - when you make backwards compatible bug fixes or documentation/instructions

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@02d62a9). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage        ?   93.86%           
=======================================
  Files           ?        7           
  Lines           ?      163           
  Branches        ?        0           
=======================================
  Hits            ?      153           
  Misses          ?       10           
  Partials        ?        0           

Flag	Coverage Δ
unittests	93.86% <0.00%> (?)

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