For Part 2 Assignment should we need to include attributes and methods to the class diagram ? Becuase In SCEA -Cade book it is mentioned as "At this point, attributes and operations
have not been added to the classes because that information will be done during the
detailed design. This diagram just shows the basic classes that will be used in the system
to provide some structure and business rules. A detailed class diagram will be created by
the developers during the design of the system ".