Add security protection files

- Added .gitattributes to protect sensitive files
- Added SECURITY.md with security policy and documentation
- Enhanced repository protection

Copyright (c) 2024 Ervin Remus Radosavlevici

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Protect sensitive files
+app/lib/crypto.ts linguist-vendored
+app/lib/auth.ts linguist-vendored
+app/middleware/security.ts linguist-vendored
+app/utils/secureStorage.ts linguist-vendored
+app/utils/securityUtils.ts linguist-vendored
+
+# Mark files as binary to prevent git from trying to merge them
+*.key binary
+*.pem binary
+*.p12 binary
+*.pfx binary
+*.jks binary
+
+# Enforce specific file attributes
+*.ts linguist-language=TypeScript
+*.tsx linguist-language=TypeScript
+*.js linguist-language=JavaScript
+*.jsx linguist-language=JavaScript
+*.scss linguist-language=SCSS
+*.css linguist-language=CSS
+
+# Copyright protection
+LICENSE linguist-documentation

SECURITY.md

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+# Security Policy
+
+## Copyright Notice
+
+Copyright (c) 2024 Ervin Remus Radosavlevici
+All rights reserved.
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability within this project, please send an email to [security@example.com](mailto:security@example.com). All security vulnerabilities will be promptly addressed.
+
+Please do not disclose security vulnerabilities publicly until they have been addressed by the maintainers.
+
+## Security Features
+
+This project implements several security features:
+
+1. **Enhanced Encryption**
+   - AES-GCM encryption with authentication
+   - PBKDF2 key derivation with high iteration count
+   - Secure random salt generation
+
+2. **Authentication System**
+   - Secure session management
+   - Protection against session hijacking
+   - Automatic session expiration
+
+3. **Security Middleware**
+   - Content Security Policy headers
+   - Rate limiting to prevent brute force attacks
+   - XSS protection headers
+
+4. **Secure Storage**
+   - Encrypted local storage
+   - Protection for sensitive data
+
+5. **Input Validation**
+   - Sanitization to prevent XSS attacks
+   - Validation for common security threats
+   - Protection against SQL injection
+
+## Best Practices
+
+When contributing to this project, please follow these security best practices:
+
+1. Never store sensitive information in client-side code
+2. Always validate and sanitize user input
+3. Use the provided security utilities for handling sensitive data
+4. Follow the principle of least privilege
+5. Keep dependencies updated to avoid security vulnerabilities
+
+## License
+
+This project is protected by copyright law. Unauthorized use, modification, or distribution is prohibited.