1. As a user, i should be able to sign up.

2. As a user, i should be able to login with my username and password.

3. As a user, my login should be cached.

4. As a user, i should be able to log out.

5. As a user, i should be able to search for a specific item's price history.

6. As a user, i should be able to search for a specific item's average price.

7. As a user, i should be able to add a new item.

8. As a user, i should be able to choose from previous grocery stores or enter a new one when adding a new item.

9. As a user, i should be able to see a list of all items.

10. As a user, i should be able to share my history with other users.

11. As a user, i should be able to see information shared by other users.

12. As a user, i should be able to stop sharing my information with other users.

13. As a user, i should be able to stop seeing information shared by other users.