System Features:
// Features for Buyer controls
-> New Buyer (Creating a Buyer profile option)
-> Update Buyer (Updaing buyer information option)
-> Buyers Details (buyers information list)
-> Delete Buyer (Delete a buyer form list)
// Features for Products Information storing
-> New Product
-> Update Product
-> Product Details
-> Remove Product
// Features for Billing
-> Generate Bill
-> Print Bill
// Features for System Control
-> Log out
-> Close Application