Fixes and setting up main method/class

Fixed constructors in BankAccount class.
Set up BankApp class with initialized accounts and client databases. I
also set up the first account and it's password.
Added set methods for BankClient variables
Login, Menu, and More setters and getters

Implemented a login system that checks the login information for a
single account.
Created Setters and getters in both the Accounts and Client Classes.