Add project files.

FactoryPattern/Samples/UserData.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace FactoryPattern.Samples;
+
+public interface IUserData
+{
+    string? Name { get; set; }
+}
+
+public class UserData : IUserData
+{
+    public string? Name { get; set; }
+}