Add some demo units

demo/demo-error@.service

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+[Unit]
+Description=Demonstrate failing units
+OnFailure=demo-notify@%n.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/false

demo/demo-limits.slice

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+[Unit]
+Description=Limited resources demo
+DefaultDependencies=no
+Before=slices.target
+
+[Slice]
+CPUQuota=10%
+MemoryLimit=1G

demo/demo-notify@.service

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+[Unit]
+Description=Demonstrate systemd templating by sending a notification
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/notify-send 'Systemd notification' '%i'

demo/demo-timer.service

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+[Unit]
+Description=Demo unit for systemd timers
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/echo "Systemd timer fired! Hello Hackeriet."

demo/demo-timer.timer

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+[Unit]
+Description=Demonstrate systemd timers
+
+[Timer]
+OnActiveSec=2
+OnUnitActiveSec=5
+AccuracySec=5
+
+# OnCalendar=Thu,Fri 2016-*-1,5 11:12:13
+
+[Install]
+WantedBy=multi-user.target

demo/notes.md

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+# simple oneshot
+
+Run `demo-notify@hello.service`
+
+# simple timer
+
+Run `demo-timer.timer`, show both
+
+# enabling
+
+Enable `demo-timer.timer`, go to symlink folder, disable
+
+# OnError
+
+Show & run `demo-error.service`
+
+# cgroups demo
+
+Start `demo-stress.service` without, show in htop, stop
+Show slice unit, start slice unit
+Add Slice=demo-limits.slice
+daemon-reload
+Start stress again
+
+# Proper service
+
+Look at nginx unit