Procedure
1. create user_menu() ----- created
2. create a class for login and registration ------ created
3. create registration for customer ----- created
4. create registration for admin ------ created
5. create registration for staff ------ created
6. create login for admin ------- created
7. create login for customer ------- created
8. create login for staff ------- created
9. create a func place_your_order() for customer ------- created
10. create a func satff_module() for staff -------- created
11. create funcs. for admin module: --------- DONE
	a. add/create product
	b. check_the_orders_by_customers
	c. exit the module
12. call each functions
13. Exit the system (WORK DONE) --------- Done