Add Google Analytics

index.html

@@ -106,6 +106,13 @@
   </div>
 
   <script src="bundle.js"></script>
+  <script async src="https://www.googletagmanager.com/gtag/js?id=UA-172544485-1"></script>
+  <script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+    gtag('config', 'UA-172544485-1');
+  </script>
 
 </body>