`jump-start config add` to add an instance to your config

[kevinschaul]

I see two use-cases:

1. Add a local directory as a jump-start instance
2. Add someone else's jump-start instance from GitHub

Are these the same subcommand or separate commands?

# Adds local directory to your config file
jump-start install <local_path>

# Clones and adds remote instance to your config file
jump-start install <instance_identifier>

That feels messy. Maybe they should be separate. Or just have users handle the cloning themselves.

jump-start install <local_path>

git clone https://github.com/kevinschaul/jump-start.git ~/dev/kevinschaul-jump-start
jump-start install ~/dev/kevinschaul-jump-start

[kevinschaul]

It could also be part of the config subcommand:

jump-start config add <local_path> <name>
jump-start config remove <name>