[Request] Add Gajim (XMPP client)

[otrapersona]

I was sadly surprised not to get results when I searched for xmpp or jabber Gajim is an XMPP client with the following characteristics:

End-to-End Encryption (...) using OMEMO, PGP, or OpenPGP. Open Source Available in 29 languages. Wikipedia and Wiktionary integration, automatic spell-checking, and much more via plugins.

Repo Builds

[pratikpc]

@otrapersona could you create a PR for the same?