Add category browsing and product filtering with breadcrumbs

src/FrontOffice.Main/Utilities/RouteConstants.cs

@@ -55,5 +55,6 @@ public static class RouteConstants
         public const string CheckoutSummary = "/checkout-summary";
         public const string Orders = "/orders";
         public const string OrderDetail = "/order/"; // usage: /order/{id}
+        public const string Categories = "/categories";
     }
 }