MAIN MENU
1. Room Management
a. Add a Room
b. Delete a Room
c. Modify a Room
d. exit
2. Customer Management
a. Add a Customer
b. Delete a Customer
c. Modify a Customer
d. Add a facility
e. Exit
3. Query
a. Room
b. Customer
4. Bill
5. Report
a. Room booked List
b. Room Available List
c. Exit
6. Exit