message: update README.md
  For systemd bootup users.
diff: @@ -31,6 +31,18 @@ Replace <b>/var/log/homebridge.stdout.log</b> with the path to your Homebridge o
  Replace <b>/var/log/homebridge.stderr.log</b> with the path to your Homebridge error log.<br />
  Replace <b>/usr/local/bin/supervisorctl restart homebridge</b> with the command you use to restart Homebridge.
  +### For Systemd
  +
  +Add this to your ~/.homebridge/config.json file
  +```JSON
  +{
  + "platform": "config",
  + "name": "Config",
  + "port": 8080,
  + "log": "/var/log/daemon.log",
  + "restart": "sudo systemctl restart homebridge.service"
  +}
  +```
  Once installed you can open the interface at http://localhost:8080. The default username is <b>admin</b> and the default password is <b>admin</b>.
  # Usage
  