Initial release of cipher-utility library

Added

• Initial release of cipher-utility library
• Cipher class for secure encryption and decryption using AES-GCM
• Support for AES-256-GCM, AES-192-GCM, and AES-128-GCM algorithms
• Scrypt key derivation with configurable parameters (N, r, p)
• Random salt and IV generation for each encryption operation
• Additional Authenticated Data (AAD) support
• Secure memory cleanup to prevent key material leakage
• Support for base64 and hex encodings
• Comprehensive TypeScript type definitions
• Complete test suite with 100+ test cases
• MIT license
• Full documentation and examples

Security Features

• AES-GCM encryption providing both confidentiality and authenticity
• Scrypt key derivation for protection against brute-force attacks
• Cryptographically secure random number generation for salts and IVs
• Authentication tag verification to detect tampering
• Secure buffer zeroing to prevent memory leakage