Adding Chapter 3 files

Chapter3/classes/carexample2.py

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+#carexample2.py
+class Car:
+    c_mileage_units = "Mi"
+    def __init__(self, color, miles):
+        self.i_color = color
+        self.i_mileage = miles
+
+if __name__ == "__main__":
+    car = Car ("blue", 1000)
+    print (car.i_color)
+    print (car.i_mileage)
+    print (car.c_mileage_units)
+    print (Car.c_mileage_units)