Adding Chapter 3 files

Chapter3/classes/methodsexample1.py

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+#methodsexample1.py
+class Car:
+    c_mileage_unit = "Mi"
+
+    def __init__(self, color, miles):
+        self.i_color = color
+        self.i_mileage = miles
+
+    def print_color (self):
+        print (f"Color of the car is {self.i_color}")
+
+    @classmethod
+    def print_units(cls):
+        print (f"mileage unit are {cls.c_mileage_unit}")
+        print(f"class name is {cls.__name__}")
+
+    @staticmethod
+    def print_hello():
+        print ("Hello from a static method")
+
+
+if __name__ == "__main__":
+    car = Car ("blue", 1000)
+    car.print_color()
+    car.print_units()
+    car.print_hello()
+
+    Car.print_color(car);
+    Car.print_units();
+    Car.print_hello()