9. As a user, I want to filter my shopping list to make it easier to locate an item in the list

[stacietaylorcima]

AC:

• Display a text field at the top of the shopping list
• As the user types into the field, the list narrows to include only items that contain the text the user entered in the filter field
• When the field has text in it, the user should be able to tap a UI element (e.g., with an "X" button next to the field) to clear the field