Please add a screen shot and a license file

[Joe Block]

I'd like to add this to awesome-zsh-plugins, but I prefer to add themes with screen shots in the readme so that users can see what they look like without having to install them.

Also, please add a license file, some people won't use any code that doesn't have an open source license. If you don't have one in mind, https://choosealicense.com is a good resource to help you select an appropriate one.

Thanks!