added c# backend

backendCs/Program_http.2cs

@@ -0,0 +1,67 @@
+using System;
+using System.Net;
+using System.Text;
+using System.Threading;
+using MySql.Data.MySqlClient;
+using Newtonsoft.Json;
+using System.Collections.Generic;
+
+class Program
+{
+  static void Main()
+  {
+    // Create an HttpListener to handle incoming HTTP requests
+    HttpListener listener = new HttpListener();
+
+    // Add a prefix to listen to, e.g., http://localhost:8080/
+    listener.Prefixes.Add("http://localhost:5000/");
+
+    // Start listening for incoming requests
+    listener.Start();
+    Console.WriteLine("Server is listening on http://localhost:5000/");
+
+    // Handle requests on a separate thread to keep server responsive
+    Thread listenerThread = new Thread(() =>
+    {
+      while (true)
+      {
+        // Wait for a request
+        HttpListenerContext context = listener.GetContext();
+
+        // Get the request and response objects
+        HttpListenerRequest request = context.Request;
+        HttpListenerResponse response = context.Response;
+
+        // Check if the requested URL is /api
+        if (request.Url.AbsolutePath == "/api")
+        {
+          // Prepare a response message
+          string responseMessage = "Hello from the API endpoint!";
+          byte[] buffer = Encoding.UTF8.GetBytes(responseMessage);
+
+          // Set the response content type and write the response
+          response.ContentType = "text/plain";
+          response.ContentLength64 = buffer.Length;
+          response.OutputStream.Write(buffer, 0, buffer.Length);
+        }
+        else
+        {
+          // Return 404 for other paths
+          response.StatusCode = 404;
+          string errorMessage = "Not Found";
+          byte[] buffer = Encoding.UTF8.GetBytes(errorMessage);
+          response.ContentType = "text/plain";
+          response.ContentLength64 = buffer.Length;
+          response.OutputStream.Write(buffer, 0, buffer.Length);
+        }
+
+        // Close the response
+        response.OutputStream.Close();
+      }
+    });
+
+    // Start the listener thread
+    listenerThread.Start();
+  }
+}
+