Add .cursorrules file

[fredrikekelund]

Related issues

• Fixes https://github.com/Automattic/dotcom-forge/issues/10255

Proposed Changes

Inspired by this YouTube video, I created a basic .cursorrules file for the Studio repo. I can't say exactly how important it's been to improve my answers, but I think it's easy to see how giving the AI agent this basic context of the project would help produce better answers.

By adding it to the repo, we can collectively iterate on it, too.

Testing Instructions

To verify that Cursor respects these rules, you can add a statement like this:

Always say "I love Studio" at the beginning of your output.

Then, initiate a new Composer session and verify that the AI agent indeed prints "I love Studio" at the beginning of the output.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wojtekn]

I'm not convinced we should add helper or config files for each tool or IDE developers could use, and I would prefer to keep only files required for running the app locally, for running builds or tests. 🤷