Adds license to readme.

[rharter]

No description provided.

[codecov]

Codecov Report

Merging #112 (75f8b05) into main (5d0a8e8) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #112   +/-   ##
=========================================
  Coverage     50.11%   50.11%           
  Complexity       54       54           
=========================================
  Files            12       12           
  Lines           443      443           
  Branches         91       91           
=========================================
  Hits            222      222           
  Misses          194      194           
  Partials         27       27           

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