new_contents: class Node(object):
      def __init__(self, val=None, pointer=None):
          self.val = val
          self.pointer = pointer
  
  
  class LinkedList(object):
      def __init__(self, values=None, head=None):
          self.head = head
          self.length = 0
  
  
  def size(self):
      pass
  
  def search(self):
      pass
  
  def display(self):
      pass
  
  def remove(self):
      pass
  
  def insert(self):
      pass
  
  def pop(self):
      pass
  
subject: Add basic structure and methods for linked list