feat: Add detailed error documentation for NR Waste Plus application - Introduced new error codes and descriptions for common issues: - G405: Method Not Allowed - G408: Request Timeout - G409: Conflict - G410: Gone - G413: Payload Too Large - G415: Unsupported Media Type - G422: Unprocessable Entity - G429: Too Many Requests - G500: Internal Server Error - G501: Not Implemented - G502: Bad Gateway - G503: Service Unavailable - G504: Gateway Timeout - P403: Insufficient Permissions - R600: Data Cannot Be Retrieved - U404: User Not Registered - Created an overarching error handling guide to assist users in understanding and resolving application errors.