Merge pull request #9 from Angel5215/project-10

DAY-052: Update README with details for project 10

DAY-052: (CHALLENGE) Save user's delivery address to UserDefaults

DAY-052: (CHALLENGE) Show an informative alert when `placeOrder` fails

DAY-052: (CHALLENGE) Do not allow address fields containing only whitespaces as valid fields

DAY-051: Send a network request with the order data

DAY-051: Add user interface for `CheckoutView`

DAY-051: Add computed property to determine cupcake cost

DAY-051: Add non-empty text field validations to `AddressView` using a computed property in `Order`

DAY-051: Use `@Bindable` when passing `Order` to allow two-binding communication between `ContentView` and `AdressView`

DAY-051: Add `CheckoutView`

DAY-051: Add initial draft of first screen UI

DAY-050: Add initial `Order` model

DAY-050: Reset contents of file

DAY-049: Load list of music items async