Fill in the missing areas of the code to make it work properly
- Add a to-do item to a list
- Display the item instantaneously
- Clear all items from the list
- Validate the form using Angular
- Use ngCloak to hide the angular mustaches {{}} on page load
- Allow duplicates in your list
- Make an 'Add item' button that toggles your form's visibility
- Hide the form after each item submission