## Issue #5: Implement User Authentication

### Description

Implement a user authentication system for the helpyourneighbour project to secure API endpoints and manage user access.

### Acceptance Criteria

- [ ] Create authentication middleware
- [ ] Implement login endpoint
- [ ] Implement registration endpoint
- [ ] Add token-based authentication
- [ ] Secure existing API endpoints with authentication

### Tasks

- [ ] Create `src/middleware/auth.js`
- [ ] Implement login route in `src/routes/auth.js`
- [ ] Implement registration route in `src/routes/auth.js`
- [ ] Add JWT token generation and validation
- [ ] Apply authentication to existing routes

### Notes

This issue addresses the need for user authentication to secure the application's API endpoints. The implementation will use JWT tokens for authentication and include both login and registration functionality.