Add repo remote add command
# Context
Whenever interacting with forks or "upstream", we may need to add a remote to current repository.
Adding an `https` is a bit more straightforward then the `ssh` version. What I normally do is navigate into the project and use the UI to click around and retrieve the clone URL.
This should be done by the `glab` command, in a similar way that `hub` exposes, see: https://hub.github.com/hub-remote.1.html.
## Proposal
Add `glab repo remote add` command, where something as simple as `namespace/project` can be passed to it and it figures out the rest.
issue