Updated README

README.md

@@ -8,4 +8,24 @@ Requirements:
 - systemd (sudo apt install systemd -y)
 
 Create service file:
-`sudo nano /etc/systemd/system/server-rack-led.service`
+`sudo nano /etc/systemd/system/server-rack-led.service`
+
+Content in the service file:
+```
+[Unit]
+Description=Server Rack LED
+After=multi-user.target[Service]
+Type=simple
+Restart=always
+ExecStart=/usr/bin/python3 /home/pi/server-rack-led/main.py
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Reload daemon, enable service and start service:
+```
+sudo systemctl daemon-reload
+sudo systemctl enable server-rack-led.service
+sudo systemctl start server-rack-led.service
+```