add connection logging example code

HTTP.Example/Program.cs

@@ -2,6 +2,8 @@
 using System.IO;
 using System.Security.Cryptography.X509Certificates;
 using System.Threading.Tasks;
+using System.Net.Sockets;
+using System.Net;
 using Uwaa.HTTP.Websockets;
 using Uwaa.HTTP.Responses;
 using Uwaa.HTTP.Routing;
@@ -19,6 +21,12 @@ static class Program
         Router router = CreateRouter();
         HttpServer httpServer = new HttpServer(80, null, router);
         HttpServer httpsServer = new HttpServer(443, cert, router);
+        
+        httpServer.OnConnectionBegin += LogConnect;
+        httpServer.OnConnectionEnd += LogDisconnect;
+        httpsServer.OnConnectionBegin += LogConnect;
+        httpsServer.OnConnectionEnd += LogDisconnect;
+
         _ = httpServer.Start();
         _ = httpsServer.Start();
 
@@ -37,6 +45,7 @@ static class Program
         subpath.Add("bar", new StaticEndpoint(new OK("A \"bar\" example sub page")));
 
         Router router = new Router();
+        router.Add(LogRequest);
         router.Add(new CORS());
         router.Add("custom", new CustomRoute());
         router.Add("subpath", subpath);
@@ -47,6 +56,32 @@ static class Program
         return router;
     }
 
+    /// <summary>
+    /// Logs a new connection to the console.
+    /// </summary>
+    static void LogConnect(TcpClient client)
+    {
+        Console.WriteLine($"{client.Client.RemoteEndPoint} connected");
+    }
+
+    /// <summary>
+    /// Logs a disconnection to the console.
+    /// </summary>
+    static void LogDisconnect(IPEndPoint endpoint)
+    {
+        Console.WriteLine($"{endpoint} disconnected");
+    }
+
+    /// <summary>
+    /// Logs a request to the console.
+    /// </summary>
+    static Task<HttpResponse?> LogRequest(HttpRequest req)
+    {
+        Console.WriteLine($"{req.Endpoint.Address}: {req.Method} {req.Path}");
+
+        return Task.FromResult<HttpResponse?>(null);
+    }
+
     /// <summary>
     /// Root endpoint: /
     /// </summary>