title: Register with phone number or Email in Asp .net core 2
body: <p>Is there any way that user can register whether by email or phone number in asp .net core 2 identity?</p>
  
  <p>I set these true, but i want to check if one of them is true then user can log into site</p>
  
  <p>config.SignIn.RequireConfirmedEmail = true;
  config.SignIn.RequireConfirmedPhoneNumber = true;</p>