Update README.md

[trappmartin]

Added MkDocs badge

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (f6a79ad) to head (581b2d6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files          33       33           
  Lines        1164     1164           
  Branches       69       69           
=======================================
  Hits         1042     1042           
  Misses         95       95           
  Partials       27       27           

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