Add classes for pizzeria ingredients

src/pizzeria/PizzaTestDrive.java

src/pizzeria/ingredients/BlackOlives.java

src/pizzeria/ingredients/Cheese.java

src/pizzeria/ingredients/Clams.java

src/pizzeria/ingredients/Dough.java

src/pizzeria/ingredients/Eggplant.java

src/pizzeria/ingredients/FreshClams.java

src/pizzeria/ingredients/FrozenClams.java

src/pizzeria/ingredients/Garlic.java

src/pizzeria/ingredients/MarinaraSauce.java

src/pizzeria/ingredients/MozzarellaCheese.java

src/pizzeria/ingredients/Mushroom.java

src/pizzeria/ingredients/Onion.java

src/pizzeria/ingredients/ParmesanCheese.java

src/pizzeria/ingredients/Pepperoni.java

src/pizzeria/ingredients/PepperoniPizza.java

src/pizzeria/ingredients/PlumTomatoSauce.java

src/pizzeria/ingredients/RedPepper.java

src/pizzeria/ingredients/ReggianoCheese.java

src/pizzeria/ingredients/Sauce.java