Add fallback check-in/out method

Add fallback check-in/out method

Hello,
I'm testing Kiosk and I think it's very useful for checking-in/out using facial recognition through the Kiosk App installed on a tablet/mobile phone hanged on the wall at the entrance of our headquarter.

Sometimes there can be issues in check-in/out using facial recognition, so I suggest to add a fallback method (i.e.: manually entering a PIN) for checking-in/out.

This be an option could be turned on/off by Admins only.

Thank you