Updated description

Author: derpycoder

index.html

@@ -26,7 +26,7 @@
 
   <!-- Generic -->
   <meta name="application-name" content="GraphiQL Playground">
-  <meta name="description" content="GraphQL Playground">
+  <meta name="description" content="Playground for testing the GraphQL endpoint created in GO">
   <meta name="keywords" content="GraphQL, Playground, GraphiQL" />
   <meta name="author" content="Abhijit Kar">