Ricard-cs NextJS-Router-Firebase-Starter-Template .cursorrules file for TypeScript

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- All project files are saved in the /src folder. 
  - src/app has the page.tsx and layout.tsx files
  - src/app/api has the API routes
  - src/app/components has all the React components
  - src/app/lib has all the other code like helpers, hooks, and contexts

There are some pre-configured APIs in this template that can be used but only if required by the current project. These have already been created:
- Firebase
  - In src/lib/firebase there is a firebase.ts configuration file as well as firebaseUtils.ts for various utility functions when interacting with Firebase Database, Storage, and Authencation
  - In src/lib/contexts there is an AuthContext.tsx file that has user authentication with Firebase set up with the onAuthStateChanged listener.
  - In src/lib/hooks there is a useAuth.ts hook