Add CONTRIBUTING.md

[bbirman]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.06%. Comparing base (4821d9e) to head (b4042de).
Report is 9 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #270   +/-   ##
=======================================
  Coverage   59.06%   59.06%           
=======================================
  Files          22       22           
  Lines        1793     1793           
=======================================
  Hits         1059     1059           
  Misses        734      734           

Flag	Coverage Δ
SalesforceFileLogger	60.38% <ø> (ø)

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