Add simple c# GetContacts api call sample

C-Sharp/GetContacts.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Net;
+using System.Text;
+using System.IO;
+
+class Program
+{
+    static void Main()
+    {
+        string fdDomain = "YOUR_DOMAIN"; // your freshdesk domain
+        string apiKey = "YOUR_API_KEY";
+        string apiPath = "/api/v2/contacts"; // API path
+        string responseBody = String.Empty;
+        HttpWebRequest request =(HttpWebRequest)WebRequest.Create("https://" + fdDomain + ".freshdesk.com" + apiPath);  
+        request.ContentType = "application/json"; 
+        request.Method = "GET"; 
+        string authInfo = apiKey + ":X"; // It could be your username:password also.
+        authInfo = Convert.ToBase64String(Encoding.Default.GetBytes(authInfo));
+        request.Headers["Authorization"] ="Basic "+authInfo;
+
+        Console.WriteLine("Submitting Request");
+        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
+        {
+            Stream dataStream = response.GetResponseStream();
+            StreamReader reader = new StreamReader(dataStream);
+            responseBody = reader.ReadToEnd();
+            reader.Close();
+            dataStream.Close();
+            //return status code
+            Console.WriteLine("Status Code: {1} {0}", ((HttpWebResponse)response).StatusCode, (int)((HttpWebResponse)response).StatusCode);
+        }  
+        Console.Out.WriteLine(responseBody);
+
+    }
+}