ci: add publish workflow, coverage reports

[morganney]

• Add publish workflow and coverage reports for CI
• Add note about how to view debug statements to the README

[codecov]

Codecov Report

Merging #8 (830fe0b) into master (51bcdbf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   77.77%   77.77%           
=======================================
  Files           3        3           
  Lines           9        9           
=======================================
  Hits            7        7           
  Misses          2        2           

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