title: Error: The name AuthenticationState does not exist in the current context
body: <p>I am doing google signin for my project . I am getting this error: 'The name AuthenticationState does not exist in the current context' in the MainActivity.cs page .Please see the attached screenshot. will it be removed by adding some nuget packages? i have added only xamarin.auth package. How to solve this error?</p>
  
  <p><a href="https://i.stack.imgur.com/4Beuq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4Beuq.png" alt="enter image description here"></a></p>