Add CONTRIBUTING.md

[bbirman]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (dev@442f131). Learn more about missing BASE report.
Report is 12 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff           @@
##             dev     #415   +/-   ##
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  Coverage       ?   76.12%           
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  Files          ?       13           
  Lines          ?      557           
  Branches       ?        0           
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  Hits           ?      424           
  Misses         ?      133           
  Partials       ?        0           

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