Add project files.

DiaryApp/Models/DiaryEntry.cs

@@ -0,0 +1,18 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace DiaryApp.Models
+{
+    public class DiaryEntry
+    {
+        //[Key]
+        public int Id { get; set; }
+        [Required(ErrorMessage = "Please enter a title")]
+        [StringLength(50, MinimumLength = 3,
+            ErrorMessage = "Title must be between 3 and 100 Characters!")]
+        public string Title { get; set; } = string.Empty;
+        [Required]
+        public string Content { get; set; } = string.Empty;
+        [Required]
+        public DateTime DateCreated { get; set; } = DateTime.Now;
+    }
+}