Create CODE_OF_CONDUCT.md

[Lucyeoh]

I looked at your project and it looks really interesting but I couldn't find a code of conduct so I added a code of conduct from Contributor Covenant, I took a guess at the contact information [williamschidi1@gmail.com] from your personal profile but feel free to change it.

[raivisdejus]

Thanks, so far people have been behaving quite civilized here, but extra reminders can't hurt.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.46%. Comparing base (4d9547d) to head (c9f75c4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #896   +/-   ##
=======================================
  Coverage   82.46%   82.46%           
=======================================
  Files          85       85           
  Lines        4682     4682           
=======================================
  Hits         3861     3861           
  Misses        821      821           

Flag	Coverage Δ
Linux	82.16% <ø> (+0.04%)	⬆️
macOS	82.33% <ø> (ø)

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