User stories for git-town

@charlierudolph @allewun adding user stories that describe end-user value
Its going into a nice direction! The first line sounds like I would need help for a particular task, the second line gives me an overview of all commands. I have adopted it into:

>  As a user having forgotten how to use Git Town
>  I want to see a helpful list of all commands
>  So that I can refresh my memory quickly and move on to what I actually wanted to do.

What do you think?