You are to create an online supermarket web site. Assume that the web site belongs to a company that
manages a number of stores across a country. Customers register and then they can order goods (e.g.
milk, bread, eggs), pay and then pick a day for delivery. There is a calendar with scheduled dates for
customers to request delivery of their goods (only for registered users) and express deliveries for cases
where customers wish to pay extra to have goods delivered immediately (e.g. they have a party on the