Add Basic User Authentication

[Somya2010]

Description

Implement basic user authentication using JWT tokens to protect routes that require authentication.

Steps to Implement

1. Install necessary packages (jsonwebtoken, bcryptjs).
2. Implement a registration endpoint (POST /auth/register) that hashes user passwords.
3. Implement a login endpoint (POST /auth/login) that returns a JWT token.
4. Add a middleware to protect private routes using JWT verification.

Expected Outcome

The app will securely handle user authentication and protect certain routes with JWT.