Added directional bearing to discuss Liskov

Overloading methods to create options

Testing the toString() methods

Overriding the toString() base class method

Setup the system with inheritance and introduced polymorphism

Added driver code and reviewed the system without inheritance

Added Car and Truck classes, no inheritance in place

Working with custom methods, stop/start car and check isRunning

Added Explicit Constructor with unit tests

Added Mutator and Accessors on Vehicle with Unit Tests