Added copyright

EonaCat.Connections.Server/Program.cs

@@ -2,6 +2,9 @@
 
 namespace EonaCat.Connections.Server.Example
 {
+    // This file is part of the EonaCat project(s) which is released under the Apache License.
+    // See the LICENSE file or go to https://EonaCat.com/license for full license details.
+
     public class Program
     {
         private static NetworkServer _server;