adding initial project and solution files

src/Web/ViewModels/Catalog.cs

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+using Microsoft.eShopWeb.Models;
+using System.Collections.Generic;
+
+namespace Microsoft.eShopWeb.ViewModels
+{
+    public class Catalog
+    {
+        public int PageIndex { get; set; }
+        public int PageSize { get; set; }
+        public int Count { get; set; }
+        public List<CatalogItem> Data { get; set; }
+    }
+}

src/Web/ViewModels/CatalogIndex.cs

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+using Microsoft.eShopWeb.Models;
+using Microsoft.AspNetCore.Mvc.Rendering;
+using System.Collections.Generic;
+
+namespace Microsoft.eShopWeb.ViewModels
+{
+    public class CatalogIndex
+    {
+        public IEnumerable<CatalogItem> CatalogItems { get; set; }
+        public IEnumerable<SelectListItem> Brands { get; set; }
+        public IEnumerable<SelectListItem> Types { get; set; }
+        public int? BrandFilterApplied { get; set; }
+        public int? TypesFilterApplied { get; set; }
+        public PaginationInfo PaginationInfo { get; set; }
+    }
+}

src/Web/ViewModels/PaginationInfo.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.ViewModels
+{
+    public class PaginationInfo
+    {
+        public int TotalItems { get; set; }
+        public int ItemsPerPage { get; set; }
+        public int ActualPage { get; set; }
+        public int TotalPages { get; set; }
+        public string Previous { get; set; }
+        public string Next { get; set; }
+    }
+}