PSK creation/edit

[ptruman]

Is your feature request related to a problem? Please describe.
WG supports PreSharedKeys for additional security - it would be good to be able to add those via the UI - and potentially have them included in the QR code (this is possible as I've done it manually)

Describe the solution you'd like
Per the above :)

Describe alternatives you've considered
N/A

Additional context
Add any other context or screenshots about the feature request here.