USER STORY: Add to basket

[tymaestro]

As a user I can add items to the shopping basket so that I can store items in one place and proceed to the checkout when ready

[tymaestro]

Acceptance Criteria

• Provide tours with a clear button to allows users to swiftly add an item to their basket
• Provide users with messages to notify them of updates to their basket

[tymaestro]

Tasks

• [x] create views to display basket
• [x] add edit and delete functionality
• [x] add a button to the empty basket that encourages users to book a tour