Add video or animated GIF demonstrating cmd2 capabilities

cmd2 has some wonderful features, but some of them are more discoverable than others and it is impossible to show how useful of a tool it is for developers with a short code snippet or static screenshot.

The “front page” README.md would benefit from replacing the static screenshot with a short video or animated GIF.

[marklalor]

Here’s a starting point to see what kind of functionality we can showcase. This could use some better compression (100MB. Actually, skipping some frames or re-recording at a lower resolution would probably be more effective for reducing file size, I already compressed it a bit)

Too big to upload directly here but here’s an imgur link ~~https://i.imgur.com/8gIQXWq.mp4~~ ok just kidding I rendered the gif wrong and it cut out too soon, consider this is a demo instead https://youtu.be/DDU_JH6cFsA

[tleonhardt]

I just learned about termtosvg which sounds potentially useful for this