Describe business value of features in specs

@charlierudolph This is a preview of what I'm planning to do with all specs. Wanted to get your feedback before I invest a lot of time into this.

This helps understand WHY the feature exists. The steps then explain HOW the feature works.
This also helps formulate the value of Git Town to teams better.
Fixed to

>  As a developer trying to extract commits from the main branch
>  I want to be reminded that this command can only be run on feature branches
>  So that I know how to do this correctly without having to memorize everything.