What problem does this feature solve?

Simple quality-of-life fix: Ignore intelliJ's workspace folder. intelliJ is my daily driver for working with code. Everytime I clone a repo and open up its contents in intelliJ, the IDE will automatically create the .idea folder for storing project-specific settings etc.

I'd rather not put .idea in my global git ignore since some projects prefer to deliberately add the workspace folders for sharing settings, live templates and stuff like that.

What does the proposed API look like?

Simply add .idea to the repo's root .gitignore

No need to create issues for this.

Alrighty! I wasn't sure if it's okay to just send a PR (without an "appropriate" issue). Thanks!