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

src/ApplicationCore/Interfaces/IBasketService.cs

@@ -0,0 +1,18 @@
+using ApplicationCore.Entities;
+using Microsoft.eShopWeb.ApplicationCore.Entities;
+using System.Security.Principal;
+using System.Threading.Tasks;
+
+namespace ApplicationCore.Interfaces
+{
+    public interface IBasketService
+    {
+        Task<Basket> GetBasket(ApplicationUser user);
+    }
+
+    public interface IIdentityParser<T>
+    {
+        T Parse(IPrincipal principal);
+    }
+
+}