add ga

Author: Jackie Dinh

example/index.html

@@ -398,6 +398,17 @@ <h5 class="title"><a href="">Get Started</a></h5>
 <script type="text/javascript" src="DetectRTC.js"></script>
 <script type="text/javascript" src="snowem.js"></script>
 <script type="text/javascript" src="app.js"></script>
+
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-115100233-2"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-115100233-2');
+</script>
+
 </body>
 </html>