add an article to help transition users from the pccc package to the medicalcoder package

[dewittpe]

re #36

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.52%. Comparing base (164c136) to head (89afb85).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   96.52%   96.52%           
=======================================
  Files          17       17           
  Lines        1295     1295           
=======================================
  Hits         1250     1250           
  Misses         45       45           

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