Adding concrete object

Author: Edrisym

DesignPattern.Proxy/ConcreteObject.cs

@@ -0,0 +1,11 @@
+namespace DesignPattern.Proxy;
+
+public class ConcreteObject(string user) : RealObject
+{
+    private readonly string _user = user;
+
+    public override string GetText()
+    {
+        return $"This text is from the concrete class for registered users {_user}";
+    }
+}