Add tests

[hugovk]

• Add metadata to setup.py

• Format with Black, isort, pyupgrage

• Test on GitHub Actions on Ubuntu/macOS/Windows with Python 3.6-3.9 and Ubuntu with Python 3.10

• Lint on GitHub Actions

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@7d2af9e). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master        #1   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?         3           
  Lines             ?        56           
  Branches          ?         0           
==========================================
  Hits              ?        56           
  Misses            ?         0           
  Partials          ?         0           

Flag	Coverage Δ
#GHA_Ubuntu	100.00% <0.00%> (?)
#GHA_Windows	100.00% <0.00%> (?)
#GHA_macOS	100.00% <0.00%> (?)

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