The following subcommands currently exist for gita group:

• add
• rm
• rmrepo

I find it unintuitive that add is not the reverse of rm. I cannot add a group without specifying any repos. I recommend the following changes:

1. The add command should be for creating groups and not require a repos argument (though repos could optionally be included)
2. An addrepo subcommand should be added that allows adding repos to an existing group.