doc: add link to README

[methane]

Fix #650

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e2a908b) 88.86% compared to head (4d85d0c) 88.86%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #692   +/-   ##
=======================================
  Coverage   88.86%   88.86%           
=======================================
  Files           7        7           
  Lines         548      548           
=======================================
  Hits          487      487           
  Misses         61       61           

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