Update public/index.html

public/index.html

@@ -34,7 +34,7 @@
     <ul id="messages"></ul>
     <form id="form" action="" style="display: none;">
         <input id="input" autocomplete="off" placeholder="Type your message..." />
-        <button>Send</button>
+        <button>Send</button> <button onclick="alert('1234 5678 9012 1234')">Random credit card number</button> <button onclick="" disabled>Restart server</button>
     </form>
 
     <script src="/socket.io/socket.io.js"></script>