Add README.md and screenshots

[luzpaz]

I'm browsing some CLI prompt software and would like to see some more info about this package, if possible. Thanks!

[imdaveho]

@luzpaz definitely on the horizon, but I'm actually in the process of changing/updating the core library to support this repo. This was originally leveraging my other repo, intermezzo, that wraps a Go library for cross platform terminal programming. But, the Go lib doesn't play too nice with Python and so I'm migrating over to Rust right now.

So in the time being..,there won't be much in the way of documentation...,sorry

Keeping it open for when these updates occur and will update you. If you let me know what you're trying to accomplish, I can point you in the right / another direction