Add `origin` remote

[philip-peterson]

Is your feature request related to a problem? Please describe.
I would like to be able to manually pull repos that were cloned by pullomatic. But right now, there are no remotes.

Describe the solution you'd like
This feature is to add a remote, origin, upon cloning.

Describe alternatives you've considered
An alternative is to just git pull path/to/the/origin. But that is rather verbose.

Additional context
N/A