metal add user

[displague]

What problem are you facing?

I want to add users as admins or collaborators to one or more projects with metal-cli.

How could the Equinix Metal CLI help solve this problem?

metal user add foo@example.com with optional -p proj_id1 -p proj_id2 -p proj_id3

Because metal init ensures the default project is used, I'd like to get away with using the bare statement above for the majority of use cases.

I’ll need a --roles option too (or multiple --role arguments).

[displague]

Depends on equinixmetal-archive/packngo#346