[cli] create: templates

[kevinwolfcr]

What the init command creates for newcomers it's fine because that suggests some conventions to use and code examples. But what if I create multiple graphql-santa projects every day? Deleting generated code may be tedious.

So my proposal is: ask for a template selection on the setup steps, which may be something like:

• world (basic example)
• shopping card (advanced example with relations)
• [inserta name here] (advanced example with many to many relations)
• custom (enter a GitHub URL)

The cool part is that the latest option will allow the user to use a custom template for creating the Santa project, therefore, the community can grow more quickly.

[jasonkuhrt]

Yep we want something here. Duplicate of #160.