Andotp: Support fingerprint as authentication method

[SeppPenner]

Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
I don't know how much effort it is but it would be nice if authentication via fingerprint was supported on device where the feature is available.

Describe alternatives you've considered
None yet.

Additional context
Maybe check https://github.com/bpellin/keepassdroid. It does have the feature enabled. (More specific, check https://github.com/bpellin/keepassdroid/blob/master/app/src/main/java/com/keepassdroid/fragments/PasswordFragment.java).

[SeppPenner]

Oh, I just found the following issues: https://github.com/andOTP/andOTP/issues/150 and https://github.com/andOTP/andOTP/issues/127. I don't know how much effort it is to integrate this here or if it's even possible.

[beerisgood]

You can already protect your database with fingerprint

[SeppPenner]

Oh, sorry :D It works. Just need to set the database security options to "Android key store" and the authentication method to "device" or so.