added main function to main class
added networkequipments package.created INetworkEquipment interface
added Router and Switch classes to networkequipments package
added enduserequipments package. Created IEndUserEquipment interface
modified the Switch class description
added Laptop and Smartphone classes to enduserequipments package
added factories package. created abstract class EquipmentsFactory
added EndUserEquipmentFactory and NetworkEquipmentFactory classes
added FactoryProducer class
added examples in main
edited FactoryProducer class description
added class diagram