systemd/*: Adding templated systemd user unit and configuration profile example.

systemd/example.conf

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+# Configuration profile for the templated systemd user unit jack@.service
+# A (modified) copy of this configuration can be used to start jackd staticly
+# for a user, which has the upside, that other systemd user units can depend on
+# it. 
+#
+# The systemd user service expects the configuration profiles to be located
+# below /etc/jack or the user's $XDG_CONFIG_HOME and can then be started using
+# ssystemctl (i.e.  `systemctl --user start jack@example`).
+#
+# For further details regarding the various options and drivers, see `man 1
+# jackd`.
+#
+
+# The name of the
+JACK_DEFAULT_SERVER="default"
+# options (e.g. -m, -n, -p, -r, -P, -t, -C, -u, -v)
+JACK_OPTIONS=""
+# backends (e.g. alsa, dummy, firewire, netone, oss, portaudio)
+DRIVER="alsa"
+# the device name
+DEVICE="hw:PCH,0"
+# specific settings for the driver in use
+DRIVER_SETTINGS=""

systemd/jack@.service

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+[Unit]
+Description=JACK server using %i.conf profile
+Documentation=man:jackd(1)
+After=sound.target local-fs.target
+
+[Service]
+Type=dbus
+EnvironmentFile=-/etc/jack/%i.conf
+EnvironmentFile=-%h/.config/jack/%i.conf
+ExecStart=/usr/bin/jackd $JACK_OPTIONS -d $DRIVER -d $DEVICE $DRIVER_SETTINGS
+LimitRTPRIO=95
+LimitRTTIME=infinity
+
+[Install]
+WantedBy=default.target