Add an example for user systemd service (#182)

README.md

@@ -291,6 +291,22 @@ details, see syntax at https://goo.gl/R74nmi). If an arg is specified in more
 than one place, then commandline values override config file values which
 override defaults.
 ```
+
+### Per-user systemd service
+Copy the systemd service file from `systemd-user` folder to a location
+suitable for user-defined systemd services (typically
+`$HOME/.config/systemd/user`).
+
+Modify the `WorkingDirectory` directive to point to the location of the
+installation, and `ExecStart` directive to configure how `fake.py` is run.
+
+To start the service and enable it so that it is run after login, run the
+following (as normal user):
+```
+$ systemctl --user start fakecam.service
+$ systemctl --user enable fakecam.service
+```
+
 ## License
 The source code of this repository are released under GPLv3.
 

systemd-user/fakecam.service

@@ -0,0 +1,26 @@
+# systemd user unit file for Linux-Fake-Background-Webcam
+# place this file into a location suitable for user-defined systemd units
+# (e.g $HOME/.config/systemd/user)
+#
+# To enable and run the fakecam service, run
+# systemctl --user enable fakecam.service
+# systemctl --user start fakecam.service
+
+[Unit]
+Description=Fake camera
+After=network.target
+
+[Service]
+Type=simple
+# specify working directory such as Git project directory
+# %h expands to the $HOME directory of the user running the service
+WorkingDirectory=%h/devel/fangfufu/Linux-Fake-Background-Webcam
+# you can use command line options here, or point the script
+# to your config file
+ExecStart=python3 fake.py -c %h/.config/fakecam/config.ini
+# fake.py exits when pressing Ctrl + \ which corresponds to SIGQUIT
+# so we need to specify this kill signal instead of SIGINT
+KillSignal=SIGQUIT
+
+[Install]
+WantedBy=default.target