public void GeraTransacaoSaida(decimal?valor, TipoCredito credito, int?clienteId)
        {
            Transacao transacao = new Transacao();

            transacao.NovaTransacaoSaida(valor, credito, clienteId);
            transacao.ConfigurarParaSalvar();
            db.Transacao.Add(transacao);
            db.SaveChanges();
        }