docs: add usage in subpath

README.md

@@ -33,17 +33,28 @@ sudo sh -c "curl -fsSL RELEASE_URL | tar -C /usr/local/bin/ -xz"
 ## Config
 
 ```json
-[
-	{
-		"path": "configui.log",
-		"ro": true
-	},
-	{
-		"path": "etc/test.ini",
-		"name": "test",
-		"action": "myip local -P"
-	}
-]
+{
+  "app_name": "ConfigUI",
+  "base_url": "/",
+  "config_path": "conf.json",
+  "no_reconfig": false,
+  "allow_ip": "",
+  "files": [
+    {
+      "path": "main.go",
+      "name": "GoPlayground",
+      "action": "go run main.go",
+      "ro": false,
+      "lang": "",
+      "order": 0,
+      "data": ""
+    }
+  ],
+  "result_bellow": false,
+  "hide_config": false,
+  "log_path": "access.log",
+  "silent_sys_out": false
+}
 ```
 
 `configui -f PATH/TO/CONFIG`
@@ -64,6 +75,27 @@ Restart=always
 WantedBy=multi-user.target
 ```
 
+## Use as a sub route
+
+```go
+cui.BaseUrl = "/configui/"
+mux := http.NewServeMux()
+mux.Handle("/configui/", http.StripPrefix("/configui", cui))
+```
+
+## Use as subpath in caddy
+
+```caddyfile
+DOMAIN {
+    ...
+    route /configui/* {
+        uri strip_prefix /configui
+        reverse_proxy localhost:8000
+    }
+    ...
+}
+```
+
 ## Api
 
 ### Files