docs: update install script and unit file

README.md

@@ -23,6 +23,13 @@ Usage: configui [options]
   -v    show version
 ```
 
+## Install 
+
+```sh
+sudo rm -f /usr/local/bin/configui
+sudo sh -c "curl -fsSL RELEASE_URL | tar -C /usr/local/bin/ -xz"
+```
+
 ## Config
 
 ```json
@@ -41,6 +48,22 @@ Usage: configui [options]
 
 `configui -f PATH/TO/CONFIG`
 
+## Systemd
+
+```ini
+; /etc/systemd/system/configui.service
+[Unit]
+Description=CoonfigUI Server
+
+[Service]
+WorkingDirectory=/home/ubuntu/ConfigUI
+ExecStart=configui -log access.log -f conf.json -bind 0.0.0.0:80
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
+```
+
 ## Api
 
 ### Files