Added basic writing editor and login/register

[Akhil-R]

This PR completes Feature Requests (#1 , #2) .

Frontend:

• React + TypeScript
• User registration/login with form validation (react-hook-form)
• JWT authentication with persistence in localStorage
• Protected routes for authenticated users
• Basic text editor with auto-save to localStorage
  • Debounce: waits 1 second after typing stops before saving
• Editor shows word/line/character count
• Lazy loading for pages (Login, Register, Editor)

Backend:

• Express server with MongoDB connection
• User model with bcrypt password hashing
• Auth endpoints: register, login, me (get current user)
• JWT middleware for protecting routes
• Zod validation schemas

How to install and run:

1. Clone the repo
2. Install dependencies: npm install
3. Run both frontend + backend together: npm run dev
   • Backend: http://localhost:5000
   • Frontend: http://localhost:5173
4. Or run separately:
   • npm run dev:backend (or go to backend folder and run npm run dev)
   • npm run dev:frontend (or go to frontend folder and run npm run dev)