public NotaFiscalBuilder IncluirItem(ItemNotaFiscal item)
 {
     this.Itens.Add(item);
     this.ValorTotal += item.Valor;
     this.ValorImpostos += item.Valor * 0.05;
     return this;
 }
 public NotaFiscalBuilder IncluirItem(ItemNotaFiscal item)
 {
     this.Itens.Add(item);
     this.ValorTotal    += item.Valor;
     this.ValorImpostos += item.Valor * 0.05;
     return(this);
 }