US15- add toggle-function at ShoppingList

[gwittm]

Value proposition

As a user I want to set a hook to all items at the shopping list In order to update my list while being e.g. in the store.

Description

Acceptance criteria

• [ ] All items at the shopping list are displayed with a checkbox
• [ ] clicking the checkbox sets and removes a hook

Tasks

• [ ] add checkbox to List-Elements at shopping-list
• [ ] add toggle-function