https://www.codeproject.com/Articles/403355/Implementing-MVC-Two-Factor-Authentication-with-Go

https://www.codeproject.com/Articles/682113/Extending-Identity-Accounts-and-Implementing-Rol

https://www.codeproject.com/Articles/98950/ASP-NET-authentication-and-authorization

Source code samples

https://github.com/TypecastException/AspNet-Identity-2-Extending-Users-And-Roles

https://github.com/TypecastException/AspNetRoleBasedSecurityExample