关键词：
## Lunch Order REST API
#### /users
- GET: Get all users
- POST: Create new user
#### /menus
- GET: Get all menus
- POST: Create menu from items list
#### /menus/:name
- GET: Get a menu
- DELETE: Delete a menu
#### /menus/:name/:items
- GET: Get all items in the menu
- POST: Add an item to menu
- DELETE: Delete an item from menu
#### /menus/:name/summary
- GET: Get menu summary (items, members, quantity)
#### /orders
- GET: Get all orders from all user
#### /orders/:user
- GET: Get orders details of an user
- POST:
- DELETE
####/people_in_charge
- GET
- POST