Add CircleCI

[31z4]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6b558e6). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   87.42%           
=========================================
  Files             ?        1           
  Lines             ?      175           
  Branches          ?        0           
=========================================
  Hits              ?      153           
  Misses            ?       20           
  Partials          ?        2

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