A few changes

-Added mutators and accessors to  the CustomerQueues class to manipulate
number of servers and service time.

-Added a List<CustomerQueue> to User object to contain the queues the
user is currently in. Considering switching to  List<int> and just
saving the queueID.

-Modified QueuesSQLServiceProvider to perform all necessary database
interactions for both type of  queues.

- Added BankingQueueController and BankingQueueManager to provide cache
and control services for  interacting with banking type queues.

-Implemented PUT function in UserSQLServieProviderContoller for updating
a user which is vital for adding queues to the user.