add CI

[stevengj]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@d6964d0). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #3   +/-   ##
=========================================
  Coverage          ?   89.01%           
=========================================
  Files             ?        4           
  Lines             ?      173           
  Branches          ?        0           
=========================================
  Hits              ?      154           
  Misses            ?       19           
  Partials          ?        0           

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