The classes and their propeties and methods .
- Order a sandwich - customer
- Take an order - staff
- Move the sandwich - staff
- pay & leave - customer
- Name
- Menu
- Line
- OrderQueue
- Counter
- Register
- Name
- Lunch
- orderSandwich
- getSandwich
- name
- shop
- queueOrder
- deliverOrder
- name
- shop
- makeSandwich
- ProcessQueue
- sandwiches
- customer
- date
- name