add CLI readme + add to root readme

[bartveneman]

closes #27

[codecov-commenter]

Bundle Report

Bundle size has no change ✅

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.32%. Comparing base (2c55c1c) to head (4fe9e1a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   98.32%   98.32%           
=======================================
  Files          14       14           
  Lines         893      893           
  Branches      107      107           
=======================================
  Hits          878      878           
  Misses         13       13           
  Partials        2        2           

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