Update README.md

Add comment for usage

Author: forrestly

README.md

@@ -1,5 +1,41 @@
 # SSCore
-dotnet core version of SuperSocket
-
+dotnet core version of SuperSocket. Pick up socket communication logic from SuperSocket, and exclude command concept.
 
 ## usage
+
+1. Create SocketServerBase object
+2. Add handler for new client connection.
+3. Start the socket server object.
+4. Implement the handler of new client connection.
+5. Add handler for receiving message.
+
+## Example
+
+
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            SocketServerBase server = new SocketServerBase();
+            server.NewClientAccepted += Server_NewClientAccepted;
+            server.Start();
+
+            Console.WriteLine("enter any key to exit.");
+            Console.ReadKey();
+        }
+
+        private static void Server_NewClientAccepted(Socket client, ISocketSession session)
+        {
+            Console.WriteLine("----- new client ------------");
+            AsyncSocketSession ass = session as AsyncSocketSession;
+
+            ass.SetReceiveHandler(arg =>
+            {
+                Console.WriteLine("----- new receive ------------");
+                string received = System.Text.Encoding.UTF8.GetString(arg.Buffer, arg.Offset, arg.BytesTransferred);
+                Console.WriteLine(received);
+
+                ass.Send(received);
+            });
+        }
+    }