Add compound debug for json

extensions/json-language-features/.vscode/launch.json

@@ -33,6 +33,14 @@
 			"sourceMaps": true,
 			"outFiles": ["${workspaceFolder}/server/out"]
 		}
-
+	],
+	"compounds": [
+		{
+			"name": "Launch Extension and Attach Language Server",
+			"configurations": [
+				"Launch Extension",
+				"Attach Language Server"
+			]
+		}
 	]
 }