CLI with Some shell command

The goal of this package is to be a drop-in replacement for the some shell commands in Rust. Commands are:

• echo — Display a message on screen.
• cd — Change Directory - change the current working Folder.
• cat — Concatenate and print (display) the content of files.
• ls — List directory contents.
• find — Search a folder hierarchy for filename(s) that meet a desired criteria.
• grep — Search file(s) for specific text.