The purpose of this exercise is to understand the concept of Java interfaces (what is it and when to use it), and learn how to create and implement multiple interfaces.
An example is given with a Penguin class (extending a Bird class), which implements a Swim interface.
The Penguin class overrrides the methods from the Swim interface.
The target is to get inspired from this example and create a Eagle class (extending a Bird abstract class),
which implements a Fly interface.
In the main method from the Nature class, all the methods from the implemented interface are called on an instance of Eagle
to check that everything works.
