recommend VSCode extensions (#10)

Author: akrantz

.vscode/extensions.json

@@ -0,0 +1,12 @@
+{
+  // See http://go.microsoft.com/fwlink/?LinkId=827846 to learn about workspace recommendations.
+  // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
+
+  // List of extensions which should be recommended for users of this workspace.
+  "recommendations": [
+    "msjsdiag.debugger-for-chrome",
+    "msjsdiag.debugger-for-edge"
+  ],
+  // List of extensions recommended by VS Code that should not be recommended for users of this workspace.
+  "unwantedRecommendations": []
+}