Update index.html

Author: Jonathan Serra

index.html

@@ -148,4 +148,13 @@ <h1>Site en construction ! Tu peux me rejoindre sur <a href="https://www.youtube
 		var jsonUri = "data:text/plain;base64," + window.btoa(JSON.stringify(partJson));
 		particlesJS.load('particles-js', jsonUri);
 	</script>
+	<!-- Global site tag (gtag.js) - Google Analytics -->
+	<script async src="https://www.googletagmanager.com/gtag/js?id=UA-80538061-4"></script>
+	<script>
+	  window.dataLayer = window.dataLayer || [];
+	  function gtag(){dataLayer.push(arguments);}
+	  gtag('js', new Date());
+
+	  gtag('config', 'UA-80538061-4');
+	</script>
 </html>