add PID

.vscode/extensions.json

@@ -1,8 +1,10 @@
 {
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
     "recommendations": [
         "platformio.platformio-ide"
     ],
     "unwantedRecommendations": [
         "ms-vscode.cpptools-extension-pack"
     ]
-}
+}