Add Design Patterns

ProxyLib/ConcreteSubject.cs

@@ -0,0 +1,10 @@
+namespace ProxyLib;
+
+internal class ConcreteSubject: ISubject
+{
+
+    public void Log()
+    {
+        Console.WriteLine("ConcreteSubject Log");
+    }
+}

ProxyLib/ISubject.cs

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+namespace ProxyLib;
+
+public interface ISubject
+{
+    void Log();
+}

ProxyLib/ProxyLib.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

ProxyLib/SubjectProxy.cs

@@ -0,0 +1,13 @@
+namespace ProxyLib;
+
+public class SubjectProxy : ISubject
+{
+    public bool CanLog { get; set; }
+    private readonly ISubject _subject = new ConcreteSubject();
+
+    public void Log()
+    {
+        if (!CanLog) return;
+        _subject.Log();
+    }
+}