Adds a section to the Contributing guidelines covering how to install SwiftLint.

[morganzellers]

Linked Issue: Closes #189

Checklist:

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

[nickkaczmarek]

I had started on this and totally didn't read your update this morning! 🤣 I confirmed on my personal machine that SwiftLint indeed needs to be installed before it'll work with our project so I'm glad this is in place. Didn't know about the pod install way though.

[codecov-commenter]

Codecov Report

Merging #191 (36cf48e) into main (edaedd0) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 36cf48e differs from pull request most recent head f8269bf. Consider uploading reports for the commit f8269bf to get more accurate results

@@           Coverage Diff           @@
##             main     #191   +/-   ##
=======================================
  Coverage   91.28%   91.28%           
=======================================
  Files          92       92           
  Lines        2375     2375           
=======================================
  Hits         2168     2168           
  Misses        207      207           

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[nickkaczmarek]

Also I think you want to update your PR template to be Closes #189 so that it closes the issue.