chore(docs): update README, fix missing example Makefile target

[ggicci]

Fixed #86

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.05%. Comparing base (baeab7e) to head (d097dbf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #87   +/-   ##
=======================================
  Coverage   95.05%   95.05%           
=======================================
  Files           2        2           
  Lines         344      344           
=======================================
  Hits          327      327           
  Misses         12       12           
  Partials        5        5           

Flag	Coverage Δ
unittests	95.05% <ø> (ø)

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