Missing information about testing the app locally

Issue in /src/pages/resources/todo-app/index.md

Hello,
This tutorial shows how to build a simple app using App builder and React. What is missing here is how to work with this app locally - When we start the app we can see two URL that allows us to test it

```
To view your local application:
-> https://localhost:9080
To view your deployed application in the Experience Cloud shell:
-> https://experience.adobe.com/?devMode=true#/custom-apps/?localDevUrl=https://localhost:9080
```

Once we implement API calls in the app we can only test it using the second link where IMS profile is available. It would be great to extend this tutorial with a section describing what is the best practice to also work with the app locally.

Additionally to this app to work we need to include our custom `App.js` which require change in `index.js` -> `import App from "./components/App";`
Cheers :)

Start with /src/pages/resources/todo-app/index.md and review the tutorial's two local application URLs, API-call steps, and the App.js setup. Clarify how to test API calls locally when the IMS profile is only available through the Experience Cloud shell, and document the required import change in index.js. Done means the tutorial explains both local workflows and the custom App.js requirement.

Written by the indexing model from the issue text.