Add UFW application profile

[Fred]

Downloads with Transmission is slow when the UFW firewall is enabled.

Add a UFW application profile.
Here is one: https://github.com/ageis/ufw-application-profiles/blob/master/applications.d/Transmission

Seems port 51413 needs to be allowed.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: transmission-gtk 3.00-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu42
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
Date: Sat Jul 18 12:52:26 2020
InstallationDate: Installed on 2013-12-26 (2395 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: transmission
UpgradeStatus: No upgrade log present (probably fresh install)