add jupyter extension to be installed when in dev container

Author: FunJim

.devcontainer/devcontainer.json

@@ -6,6 +6,11 @@
     "customizations": {
       "codespaces": {
         "openFiles": ["tutorial/README.md"]
+      },
+      // Configure properties specific to VS Code.
+      "vscode": {
+        // Add the IDs of extensions you want installed when the container is created.
+        "extensions": ["ms-toolsai.jupyter"]
       }
     }
   }