Adding section regarding commit message format to CONTRIBUTING.md.

[morganzellers]

Checklist:

• [x] Did you sign the Contributor License Agreement?
• [x] Is the linter reporting 0 errors?
• [x] Does the CI pipeline pass?
• [x] Did you update the documentation?

[codecov-commenter]

Codecov Report

Merging #106 (547501a) into main (082b711) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #106   +/-   ##
=======================================
  Coverage   94.82%   94.82%           
=======================================
  Files          65       65           
  Lines        1680     1680           
=======================================
  Hits         1593     1593           
  Misses         87       87           

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