$2.$ Define the Node class for a Doubly linked list. Define a doubly lined list class that uses this Node. Implement the node as well as the Doubly Linked list classes. In the doubly linked list class include a default constructor and functions append, prepend and print that displays all the elements of the doubly linked list. Implement your classes and write a main function in which you populate a doubly linked list by appending and prepending then print the list.