Update vim/xdebug.md

vim/xdebug.md

@@ -46,6 +46,26 @@ Show current settings
 ```sh
 php -r 'xdebug_info();'
 ```
+
+## Adapter
+
+`packages/php-debug-adapter/extension/package.json`
+
+```json
+"port": {
+    "type": "number",
+    "description": "Port on which to listen for Xdebug",
+    "default": 9003
+},
+"php.debug.ideKey": {
+    "type": "string",
+    "default": "vsc",
+    "description": "A unique key that allows the proxy to match requests to your editor. Only used when proxy configuration includes replacement.",
+    "scope": "machine-overridable"
+}
+```
+
+
 ## Trigger