Adding additional documentation to the new Styling Guide Readme

[runningonsideprojects]

Fixes #3821

Changes: Adding some more documentation within the new Style Guide readMe.

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines

[raclim]

Thanks for working on this!

I think this is a great start so far! Will merge this in to add some more context to this doc!