Method insert

Sorting Algorithims/quicksort_linkedlist.py:21–24

(self, new_data: int)

    # method to insert nodes at the start of linkedlist
    def insert(self, new_data: int) -> None:
        new_node = Node(new_data)
        new_node.next = self.head
        self.head = new_node

    # method to print the linkedlist
    def printLL(self) -> None: