move PAUL.yaml -> .github/PAUL.yaml

[tbrasser]

• moves PAUL.yaml from root to .github/PAUL.yaml
• adds comments to clarify options
• adds main as protected branch (in preparation for moving from master to main branch: #144 )

[codecov[bot]]

Codecov Report

Merging #157 (609bcdf) into master (f04c967) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #157   +/-   ##
=======================================
  Coverage   70.55%   70.55%           
=======================================
  Files          10       10           
  Lines         411      411           
=======================================
  Hits          290      290           
  Misses        104      104           
  Partials       17       17           

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