Installment Model - Initial

Installment.cs

public class Installment
{
    public string Id { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public uint InstallmentFrequencyInDays { get; set; }
    public decimal DownPayment { get; set; }
    public uint TotalInstallments { get; set; }
    
}