Added firebase sdk snippet

Author: adarshguptacse18

index.html

@@ -463,6 +463,15 @@ <h4 class="card-title font-weight-bold mb-2">The Destroyers</h4>
     <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
         integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
         crossorigin="anonymous"></script>
+    <!-- The core Firebase JS SDK is always required and must be listed first -->
+    <script src="/__/firebase/8.1.2/firebase-app.js"></script>
+
+    <!-- TODO: Add SDKs for Firebase products that you want to use
+     https://firebase.google.com/docs/web/setup#available-libraries -->
+    <script src="/__/firebase/8.1.2/firebase-analytics.js"></script>
+
+    <!-- Initialize Firebase -->
+    <script src="/__/firebase/init.js"></script>
 
     <!-- The core Firebase JS SDK is always required and must be listed first -->
     <!-- <script src="/__/firebase/8.1.2/firebase-app.js"></script>