Feature: Be able to pull template from Git Repository

[zacharyjones123]

Proposal

This is a fantastic tool! I used it a couple times last night and I'm in love. One thing I think that could be added is that the --destination could be a git repository. Then inside of the git repository there are multiple templates that the program will see, and then give the user a choice of which template to use. (Basic, pipeline, API, etc).

Why?

I believe this would give a fantastic user experience, while also having templates exist in version control

Concerns

• I'm not completely sure if this should be part of go-archetype, or something build on top of it. That is a design decision but I believe that perks of the new feature make it a necessity.