[Future] add shopping list

- [ ] add shopping list menubar option
- [ ] add option, where user can add the ingredients from the recipe with one button
- [ ] add option, where user can add the ingredients individually from the recipe with the plus buttons
- [ ] if ingredients were added to shopping list, pop up an alert with the amount and name of the ingredient
- [ ] keep tag of the ingredients in the shopping list, where you can add the same ingredient twice, and it adds the amount together
- [ ] add function, to delete the item from the shopping-list
- [ ] add function, where user can edit the amount of the item
- [ ] add function, to delete all item from the shopping list with one button
- [ ] add function, to delete selected items at once