Simple symmetric GPG file encryption and decryption

The `crypto` library provides a simple command-line interface for symmetric Gnu Privacy Guard (gpg) encryption and decryption of one or more files on Unix and Linux platforms. It acts as a wrapper around the external `gpg` command-line tool. Encryption is performed using the AES256 cipher algorithm. The current version is 1.4.1. While the GitHub repository shows some minor activity, the last PyPI release was in 2015, indicating a low maintenance or stable (feature-complete but not actively developed) status for this specific Python package.