Add EditorConfig to extensions.json

Adding the EditorConfig extension to recommended extensions will help ensure consistent code formatting. It'll automatically run and read from the `.editorconfig` file in the project root.

.vscode/extensions.json

@@ -2,8 +2,9 @@
   "recommendations": [
     "nrwl.angular-console",
     "angular.ng-template",
+    "EditorConfig.EditorConfig",
     "ms-vscode.vscode-typescript-tslint-plugin",
     "esbenp.prettier-vscode",
     "firsttris.vscode-jest-runner"
   ]
-}
+}