build(multiple): Recommend installing the angular language service extension

Author: jermowery

.vscode/extensions.json

@@ -3,5 +3,9 @@
   // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
 
   // List of extensions which should be recommended for users of this workspace.
-  "recommendations": ["ms-vscode.vscode-typescript-tslint-plugin", "esbenp.prettier-vscode"]
+  "recommendations": [
+    "ms-vscode.vscode-typescript-tslint-plugin",
+    "esbenp.prettier-vscode",
+    "angular.ng-template"
+  ]
 }