adding missing file

Signed-off-by: Vanessa Sochat <[email protected]>

Author: vsoch

_includes/google-analytics.html

@@ -0,0 +1,8 @@
+{% if site.google-analytics %}<script async src="https://www.googletagmanager.com/gtag/js?id=UA-143467500-1"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', '{{ site.google-analytics }}');
+</script>{% endif %}