[bug#30971] Add package definition for fpm2

[Ton]

Here is the package definition for figaros password manager, or fpm2. It is a
simple password manager. Development has seized and the package should be
considered dead. I had use for it personally and thought I'd share it. There
is a warning in the description.

Built and tested on GuixSD Linux merlin 4.15.8-gnu #1 SMP 1 x86_64 GNU/Linux.

It passes guix lint without errors.

It builds 5 times deterministicly.

Guix size says "total: 486.5 MiB"

0001-Add-package-definition-screen-message.patch
Description: Text Data

pgpvZhrFklCr1.pgp
Description: OpenPGP digital signature