Adding cart/basket support and applicationuser (without EF requirement)

src/ApplicationCore/Entities/Basket.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace Microsoft.eShopWeb.ApplicationCore.Entities
+{
+    public class Basket : BaseEntity<string>
+    {
+        public string BuyerId { get; set; }
+        public List<BasketItem> Items { get; set; } = new List<BasketItem>();
+    }
+}