Add .cursorrules file

[NickAnthony]

Describe the feature you'd like to request

I'd like a .cursorrules file that outlines:

1. Structure of the repo
2. Libaries/tooling used
3. Style preferences

Describe the solution you'd like to see

Just a .cursorrules file. Should be straightforward.

Additional information

Make the cursor agents much better at writing code.

[juliusmarminge]

hmm not sure

Related: https://x.com/thomaspaulmann/status/1867117681486201041