Add README

[Leko]

• Write tests
• Fix flow errors

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@023c279). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #9   +/-   ##
=========================================
  Coverage          ?   27.27%           
=========================================
  Files             ?        1           
  Lines             ?       11           
  Branches          ?        3           
=========================================
  Hits              ?        3           
  Misses            ?        7           
  Partials          ?        1

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