Added createAccount()

Added function to inset account data into the DB
Updated AddCustomer(), cleaned up code.

Added a ModelController reference to AddCustomer constructor. Deleted
auto generated main method.
Added button events

Added event handlers for submit and cancel buttons.
Centered JFrame upon creation
Condensed code

Condensed date format and removed debug printline.
Updates and code condensing

Added refresh button and updateResults method, updated Add Customer and
Exit button functionality, centered JFrame, consolidated JTable refresh,
removed autogenerated main method.