Init git repo via flag

It would be nice to have a flag to have the CLI run `git init` in the new project's folder. Easiest might be `--git`.

A possible alternate route would be to have the ability to specify a remote origin (maybe via `--repository=...` or `--git=...`). The would run `git init` and then set the remote origin.

Start by locating the CLI flag parsing and the project-folder creation flow. Decide whether the first scope is a --git flag for git init or also remote-origin configuration, then verify that the chosen behavior initializes the new project as requested.

Written by the indexing model from the issue text.