Add public initializer for CreditCard Model

Release Notes

• Add public initializer for CreditCard Model

Description

• Now you can try to use the model as a placeholder or something else

struct CreditCardCell_Previews: PreviewProvider {
    static var previews: some View {
        CreditCardCell(creditCard: CreditCard(number: "1234-1234-1234-1234", name: "Aaron Lee", expireDate: nil))
    }
}