增加 systemd 服务。

Signed-off-by: rick.chan <cy@haoan119.com>

Ecology/LubanCat1/LubanCat1_安装_Weston.md

@@ -104,3 +104,27 @@ sudo ninja -C build/ install
 ```bash
  weston --tty=2
 ```
+
+systemd service（/usr/lib/systemd/system/weston.service）如下：
+
+```service
+[Unit]
+Description=Weston
+# After=syslog.target
+# After=network.target
+# After=multi-user.target
+# After=graphical.target
+After=plymouth-quit-wait.service
+# After=systemd-logind.service
+
+[Service]
+RestartSec=2s
+Type=simple
+User=root
+Group=root
+ExecStart=weston-launch --tty=/dev/tty2 --user=root
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
+```