Update project structure for VSCode

ref. https://github.com/Microsoft/vscode-react-native/blob/master/doc/customization.md#project-structure

Author: droibit

.vscode/settings.json

@@ -1,4 +1,6 @@
 {
   "files.autoSave": "afterDelay",
   "editor.tabSize": 2,
+
+  "react-native-tools.projectRoot": "./example"
 }