Insert node at beginning of circular doubly linked list
A circular doubly linked list is a data structure in which each node contains a data element and two pointers: one to the next node in the list and one to the previous node in the list. In a circular doubly linked list, the last node points back to the first node, forming a loop.
To insert a node at the beginning of a circular doubly linked list, you need to perform the following steps:
 Create a new node with the data to be inserted.
 If the list is empty, set the new node as the first node and set its next and previous pointers to itself.
 If the list is not empty, set the new node as the first node by updating its next pointer to point to the current first node and its previous pointer to point to the last node in the list.
 Update the next and previous pointers of the current first node and last node to point to the new node.
For example insert [1,2,3,4,5,6].
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