added template for receiving json chat message

SharedClientServer/JSONConvert.cs

@@ -0,0 +1,17 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SharedClientServer
+{
+    class JSONConvert
+    {
+        public static (string,string) GetUsernameAndMessage(byte[] json)
+        {
+            string msg = Encoding.ASCII.GetString(json);
+            dynamic payload = JsonConvert.DeserializeObject(msg);
+            return (payload.username, payload.message);
+        }
+    }
+}