public SignUpPage(SignUpViewModel viewModel)
{
InitializeComponent();
BindingContext = viewModel;
viewModel.BindText(EmailEntry, vm => vm.Email.Value);
viewModel.BindErrors(EmailEntry, vm => vm.Email.IsValid);
viewModel.BindText(PasswordEntry, vm => vm.Password.Value);
viewModel.BindErrors(PasswordEntry, vm => vm.Password.IsValid);
SignUpButton.Clicked += async(s, e) => await this.AlertAction(Loader, _ => viewModel.SignUp());
SignInButton.Clicked += async(s, e) => await viewModel.SignIn();
}
