Update README with service instructions

README.md

@@ -18,14 +18,34 @@ Output will be stored in `output_file` if specified.
 {"status": 1, "charge": {"left": 90, "right": 90, "case": 50}, "charging": "one", "model": "AirPods Pro", "date": "2020-10-23 09:10:11"}
 ```
 
+### Installing as a service
+
+Create the file `/etc/systemd/system/airstatus.service` (as root) containing:
+```
+[Unit]
+Description=AirPods Battery Monitor
+
+[Service]
+ExecStart=/usr/bin/python3 /PATH/TO/AirStatus/main.py /tmp/airstatus.out
+
+[Install]
+WantedBy=default.target
+```
+
+Start the service:
+```
+sudo systemctl start airstatus
+```
+
+Enable service on boot:
+ ```
+sudo systemctl enable airstatus
+```
+
 #### Can I customize it easily?
 **Yes, you can!**
 
 You can change the **update frequency** within the main.py file
 
-#### Why percents are displayed in dozens?
-This is Apple restrictions, only genius or Apple can fix that :(
-
 #### Used materials
 * Some code from [this repo](https://github.com/ohanedan/Airpods-Windows-Service)
-* Battery icons from [Icons8](https://icons8.com/icon/set/battery/windows)