Added sample program with imported doubly_linked_list module

test_dbl_linked_list.py

@@ -0,0 +1,15 @@
+import doubly_linked_class    # Module
+
+
+dll = doubly_linked_class.DoublyLinkedList()   # Instantiate a doubly_linked list
+
+dll.append((6, 8, 9, 0))                  # Add the tuple as the first element
+dll.prepend([6,7,8,9])                    # Add list at the front of the list
+dll.append({'Height': 68})                # Add dictionary at the end of the list
+dll.insert_at_position(1, {8, 3, 5, 5})   # Add set of unique elements at index 1
+dll.print_list()                          # Print the doubly_linked list
+
+print(dll.search([6, 7, 8, 9]))           # Return True if the data is an element of the linked list
+
+
+