14. As a component, I want to initialize an empty firestore 'items' collection when a new user is created

[Mandihamza]

At the moment, we create both new users and list items in the same collection.

AC:

• When a user creates their first item, create a firestore collection to store their list of items. This collection will store items for that user only.
• Update and add new titles in database & app to correctly identify what they represent.
  • list > users
  • items > list

Current data structure:

New data structure: