Add citation to README

[odow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.72%. Comparing base (295c1dc) to head (7340440).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #132   +/-   ##
=======================================
  Coverage   98.72%   98.72%           
=======================================
  Files          12       12           
  Lines        1101     1101           
=======================================
  Hits         1087     1087           
  Misses         14       14           

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