[FEATURE REQUEST] Notification on completed torrent

[warmoans]

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

Describe the solution you'd like
Notification is shown when torrent completes downloading.

Describe alternatives you've considered
I don't see any alternatives to this.

Additional context
A notification of completed torrent on my phone would be something I pay more attention to then an email sent by qbittorrent. Also emails leave a trail.

Another qbittorrent client on the play store has this feature.
https://play.google.com/store/apps/details?id=me.fengmlo.qbRemot

And there's early support for push notification
https://github.com/fengmlo/qbittorrent-remote-translation/blob/master/server_push.md