start documenting the GitHub tables

[patrickdevivo]

Starts to document the GitHub tables in the README, will wait to merge as more GitHub functionality is added

[codecov-commenter]

Codecov Report

Merging #146 (0b0c3c2) into main (1081727) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #146   +/-   ##
=======================================
  Coverage   69.13%   69.13%           
=======================================
  Files          28       28           
  Lines        1416     1416           
=======================================
  Hits          979      979           
  Misses        274      274           
  Partials      163      163           

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