🔨 Add .vscode/extensions.json

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "marlinfirmware.auto-build",
+        "platformio.platformio-ide"
+    ]
+}