Refactoring and Adding Tests (#58)

* Moving Identity seeding to its own class and method.

* Adding tests for AddItem

* Added catalog api controller and functional tests
Added and cleaned up some comments

* Adding integration tests for OrderRepository

* Getting integration test for order working with inmemory db

src/Infrastructure/Identity/AppIdentityDbContextSeed.cs

@@ -0,0 +1,14 @@
+using Microsoft.AspNetCore.Identity;
+using System.Threading.Tasks;
+
+namespace Infrastructure.Identity
+{
+    public class AppIdentityDbContextSeed
+    {
+        public static async Task SeedAsync(UserManager<ApplicationUser> userManager)
+        {
+            var defaultUser = new ApplicationUser { UserName = "demouser@microsoft.com", Email = "demouser@microsoft.com" };
+            await userManager.CreateAsync(defaultUser, "Pass@word1");
+        }
+    }
+}