CLI Tool

Summary

A command-line tool (e.g. a task manager or file renamer) — practice for `process.argv`, the `fs` module, and packaging a script as a runnable CLI.

• 1Parse command-line arguments manually or with a library like `commander`.
• 2Add colored terminal output for better UX, e.g. with `chalk`.
• 3Package it with a `bin` field in `package.json` so it can be installed globally.