Add Countable class and StaticDemo pgm.
Add static class demo Metric.
Add PassObject pgm.
Add PassObject2 pgm.
Add ReturnObject pgm.
Add Stock class and StockDemo pgm.
Add equals method.
Add StockCompare to test equals method.
Add copy method.
Add ObjectCopy pgm to test copy method.
Add Instructor, TextBook and Course classes and CourseDemo pgm
Add EnumDemo pgm.
Add enum Car classes and SportsCarDemo pgms.
Add new Constructor that accepts a Stock object.
Add StockPurchase class and StockTrader pgm.