Add server configuration instructions and scripts

Hi Emmanuel, I added scripts to configure the NIO2 connector protocol in the server.

When the connection times out and I click the button to 'Say Hello', I see that old message:
The message was sent! You can view the message in the server log

I assume the only time that displays is when the connection times out and the "websocket.onmessage" event doesn't fire. If that's the case, should it say something to indicate the message wasn't sent and to reconnect?