Add Google Analytics tracking script

Needed to add Google Analytics code

Author: waydes

rmd/GA_analytics.html

@@ -0,0 +1,9 @@
+<!-- Google tag (gtag.js) -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=G-37JJNBGH0H"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'G-37JJNBGH0H');
+</script>