Add llms.txt to the docs

[azizbecha]

Is your feature request related to a problem? Please describe.
AI sometimes writes bad Paper code, it's not always up-to-date with the documentation.

Describe the solution you'd like
Adding custom llms.txt to help AI implement Paper with fewer mistakes.

Describe alternatives you've considered
Manual copy/paste of the docs.

[PavaniKandi]

I am working on this and preparing a PR. The plan is to add a docs/static/llms.txt file that points AI tooling to the official React Native Paper docs and repository so generated guidance is more likely to stay aligned with the current docs.