Moved main interface file, delivery boy interface file, and manager interface file to a new folder named interface
Modified seed.rb into pizzahut.rb
Modified deliverer.rb interface file into interface_deliverer.rb, main.rb interface file into interface_main.rb and manager.rb interface file into interface_manager.rb
Renamed interface_main.rb to ui_main.rb, interface_manager.rb to ui_manager.rb and interface_deliverer.rb to ui_deliverer.rb for brevity sake