Add Google analytics

Author: ratulm

_includes/tracking-header.html

@@ -1 +1,11 @@
-<!-- This goes before </head> closing tag, Google Analytics can be placed here --> 
+<!-- This goes before </head> closing tag, Google Analytics can be placed here --> 
+
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-YFVVT140ZR"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'G-YFVVT140ZR');
+</script>