Add version argument

[Ethan-Arrowood]

Explain your idea briefly
This cli arg will output the version of the cli tool

What value will this add to the project?
Useful for tracking down bugs. Can be useful for tutorials (verifying the user is using a similar CLI version to that of the tutorial).

Will you be contributing this yourself?
Yes

What is this idea based on? List examples
Literally any other CLI (--version -v)