doc: Add CHANGELOG.md

[inkydragon]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.21%. Comparing base (9380656) to head (67bd8d7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #189   +/-   ##
=======================================
  Coverage   97.21%   97.21%           
=======================================
  Files           8        8           
  Lines         827      827           
=======================================
  Hits          804      804           
  Misses         23       23           

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