Role Field be DropDown Selection

[DilanGoodwin]

Update the Role value to be a possible Drop Down menu item that is pulled from a database.

If the Role entered is not already within the database update the database to contain the new value for the next time a user is assigned a role.

All roles stored within the Database should be stored within lowercase to avoid possible capatilisation conflicts when checking if the value is already within the databse.

Later down the line this would allow for sorting of employees based on their roles within the company.