Will require api endpoint to fetch the cart items

[chrisK00]

On a CartController there should be a Get endpoint that returns a Cart including its CartItems and then include the Product inside the CartItem.

We need a response model for a cart that should have:

• The Id of the cart
• A List of Cart Items
• The Total Price of all the items
• How many items there are

and a response model for a Cart Item that should have:

• The id of the Cart Item
• A Product
• Total Price of the Product.Price * Amount
• Amount

You can configure mapster to automatically make the calculations when mapping from a Cart to a CartResponse and CartItem to CartItemResponse.

1. Mapster has a global TypeAdapterConfig.GlobalSettings and a .Scan method that can be used to scan the assembly for mappings
2. Create a Mapping class for an entity and the class should implement IRegister
3. Inside the Register method the syntax for adding a mapping is like automapper, config.NewConfig<FromType, ToType>().Map(destination => , source => )

child of #70