## Issue #12: Implement Security Best Practices

### Description

Implement security best practices to protect the helpyourneighbour application from common vulnerabilities.

### Acceptance Criteria

- [ ] Add security headers to HTTP responses
- [ ] Implement CORS configuration
- [ ] Add CSRF protection
- [ ] Secure API endpoints against common attacks
- [ ] Review and apply security recommendations

### Tasks

- [ ] Install and configure helmet.js for security headers
- [ ] Configure CORS middleware
- [ ] Implement CSRF protection
- [ ] Add input sanitization
- [ ] Review application for security vulnerabilities

### Notes

This issue addresses the need to implement security best practices to protect the application from common web vulnerabilities. The implementation will include security headers, CORS configuration, CSRF protection, and input sanitization to ensure the application is secure against attacks like XSS, CSRF, and other common threats.