public PersonaViewModel()
{
Personas = servicio.getAll();
SaveCommand = new Command(async() => await Save(), () => !IsBusy);
UpdateCommand = new Command(async() => await Update(), () => !IsBusy);
RemoveCommand = new Command(async() => await Delete(), () => !IsBusy);
CleanCommand = new Command(Clean, () => !IsBusy);
}