Added ReviewAggregateModel

DAL/Models/ReviewAggregate.cs

+using System.ComponentModel.DataAnnotations;
+
+namespace DAL.Models
+{
+    public class ReviewAggregate
+    {
+        [Key]
+        public Guid RestaurantId { get; set; }
+
+        // Add Restaurant property?
+
+        [Required]
+        [Range(1, 10)]
+        public uint FoodRating { get; set; }
+
+        [Required]
+        [Range(1, 10)]
+        public uint ServiceRating { get; set; }
+
+        [Required]
+        [Range(1, 10)]
+        public uint EnvironmentRating { get; set; }
+    }
+}