void List::push_begining(int value)
{
	List *new_elem = new List;

	head = new_elem;
	new_elem->data = value;
	new_elem->prev = nullptr;
	new_elem->next = head;
	list_size++;

	if(new_elem->next)
	{
		new_elem->next->prev = new_elem;
	}
	else
	{
		tail = new_elem;
	}
}