Add classes for pizzeria ingredients

src/pizzeria/ingredients/SlicedPepperoni.java

src/pizzeria/ingredients/Spinach.java

src/pizzeria/ingredients/ThickCrustDough.java

src/pizzeria/ingredients/ThinCrustDough.java

src/pizzeria/ingredients/Veggies.java

src/pizzeria/pizza/ChicagoStyleCheesePizza.java

src/pizzeria/pizza/ChicagoStyleClamPizza.java

src/pizzeria/pizza/ChicagoStylePepperoniPizza.java

src/pizzeria/pizza/ChicagoStyleVeggiePizza.java

src/pizzeria/pizza/NYStyleCheesePizza.java

src/pizzeria/pizza/NYStyleClamPizza.java

src/pizzeria/pizza/NYStylePepperoniPizza.java

src/pizzeria/pizza/NYStyleVeggiePizza.java

src/pizzeria/pizza/Pizza.java

src/pizzeria/store/ChicagoPizzaStore.java

src/pizzeria/store/NYPizzaStore.java

src/pizzeria/store/PizzaStore.java

src/readme.txt