added systemd-unit

README.md

@@ -1,2 +1,21 @@
 # openrgb-systemd-unit
 User-Systemd-Unit for OpenRGB
+
+---
+
+For use with https://gitlab.com/j-be/OpenRGB on Linux.
+This Systemd-User-Unit sets a given Color to your OpenRGB-Controlled RGBs, and turns them off again on shutdown. 
+
+## Usage
+
+```
+ mkdir -p ~/.config/systemd/user/
+ cp openrgb.service ~/.config/systemd/user/
+ systemctl --user daemon-reload
+ systemctl --user enable openrgb.service
+ ```
+ This assumes, that your OpenRGB-Executable is available under `~/bin/OpenRGB/OpenRGB`, as it would be, if you checked the OpenRGB-Repo out in your `~/bin`. 
+ 
+ ## Known Problems
+ * If you plan to use Profiles, test them first. I Encountered many combinations, where I end up with broken Profiles, which did not work, even if the User-Unit does. From my understanding the profiles should be world-readable also. 
+ * When you also plan to start the GUI of OpenRGB as an autostart-entry of your desktop, you might want to delay the GUI with `sleep5; ./OpenRGB` or something similar. During testing, when both, the Systemd-Unit and the GUI were starting more or less simultaneously, there was a high chance, that the OpenRGB-thread raised by the unit becomes unresponsive, and became a zombie when trying to kill it. 

systemd/user/openrgb.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=OpenRGB control
+
+[Service]
+Type=simple
+ExecStart=%h/bin/OpenRGB/OpenRGB -c 00FFFF -m Static
+ExecStop=%h/bin/OpenRGB/OpenRGB -c 000000 -m Static
+RemainAfterExit=yes
+
+[Install]
+WantedBy=default.target