Moved websocket echo server example

examples/websocket_echo_server/index.html

@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<title>WebSocket Test</title>
+<script language="javascript" type="text/javascript">
+
+  var out = function(message) {
+    var div = document.createElement('div');
+    div.innerHTML = message;
+    document.getElementById('output').appendChild(div);
+  };
+
+  window.onload = function() {
+    var url = 'ws://' + location.host + '/ws';
+    var num_messages = 0;
+
+    websocket = new WebSocket(url);
+    websocket.onopen = function(ev) {
+      out('CONNECTED');
+      var msg = 'Не всё подчиняется разуму. Но всё подчиняется упорству. ';
+      out('SENT: ' + msg);
+      websocket.send(msg);
+    };
+    websocket.onclose = function(ev) {
+      out('DISCONNECTED');
+    };
+    websocket.onmessage = function(ev) {
+      if (!ev.data) {
+        out('<span style="color: blue;">PING... </span>');
+      } else {
+        out('<span style="color: blue;">RESPONSE: ' + ev.data + ' </span>');
+        num_messages++;
+      }
+      if (num_messages > 3) {
+        websocket.send('exit');
+      }
+    };
+    websocket.onerror = function(ev) {
+      out('<span style="color: red; ">ERROR: </span> ' + ev.data);
+    };
+  };
+</script>
+<style> div {font: small Verdana; } </style>
+<h2>Mongoose WebSocket Test</h2>
+
+<div id="output"></div>
+</html>