Add subkey support #164
Description
Is your feature request related to a problem? Please describe.
I want to create a master key with multiple subkeys. Currently it is only possible to create one subkey via the gen_key method.
Describe the solution you'd like
I would implemented the quick-add-key command.
Describe alternatives you've considered
An alternative would be to implement the edit-key command. This was already discussed in #25 as being complicated. And closed without a result.