Provide a way to define and get help/description about gptscripts .

[sangee2004]

Currently , I need to actually look at the script (usually the first prompt in the script) to understand what the script does and what inputs can be provided for the script.

It would be helpful to provide a way to get an overall description of what the tool does and what input can be provided with some command like gptscript <script-name> --help

[cjellick]

I lke this idea. Would want @ibuildthecloud to agree before we did it