Ported progress from SPA and began scaffolding Identity UI.

Laid some groundwork in backend.

Began customizing Identity UI.

Props/Models/User/ResultsPreferences.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Text.Json;
+
+namespace Props.Models
+{
+    public class ResultsPreferences
+    {
+        public int Id { get; set; }
+        [Required]
+        public string ApplicationUserId { get; set; }
+
+        [Required]
+        public IList<Category> Order { get; set; }
+
+        public ResultsPreferences()
+        {
+            Order = new List<Category>(Enum.GetValues<Category>().Length);
+            foreach (Category category in Enum.GetValues<Category>())
+            {
+                Order.Add(category);
+            }
+        }
+
+        public enum Category
+        {
+            RatingPriceRatio,
+            Reviews,
+            Purchases,
+            Price,
+        }
+    }
+}