Add project files.

DataDomain/Person.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataDomain
+{
+    public class Person
+    {
+        public int Id { get; set; }
+        public string? FirstName { get; set; }
+        public string? LastName { get; set; }
+        public string? NickName { get; set; }
+        public DateTime? Born { get; set; }
+    }
+}