feat: add loading parameter

Author: armand1m

README.md

@@ -69,6 +69,7 @@ const App = ({
   setError,
   user,
   error,
+  loading,
 }: WrappedComponentProps) => (
   <React.Fragment>
     {
@@ -82,6 +83,10 @@ const App = ({
         ? <button onClick={signOut}>Sign out</button>
         : <button onClick={signInWithGoogle}>Sign in with Google</button>
     }
+
+    {
+      loading && <h2>Loading..</h2>
+    }
   </React.Fragment>
 );