Update LinkedList reference in readme.md

Author: sushant097

coding_solutions/DataStructure_related/6_LinkedList_Cycle.py renamed to coding_solutions/DataStructure_related/LinkedList/6_LinkedList_Cycle.py

@@ -3,5 +3,9 @@
 | :----: | :-----------------------------: | :----: |
 | 1 | [Delete Node in a Linked List](https://leetcode.com/problems/delete-node-in-a-linked-list/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/DataStructure_related/LinkedList/1_Delete_a_node_LL.py) |
 | 2 | [Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/DataStructure_related/LinkedList/2_Delete_a_nth_node_LL.py) |
+| 3 | [Reverse a Linked List](https://leetcode.com/problems/reverse-linked-list/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/DataStructure_related/LinkedList/4_Reverse_LinkedList.py) |
+| 4 | [Merge two sorted list](https://leetcode.com/problems/merge-two-sorted-lists/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/DataStructure_related/LinkedList/3_MergeTwoSortedList.py) |
+| 5 | [LinkedList a cycle](https://leetcode.com/problems/linked-list-cycle/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/DataStructure_related/LinkedList/6_LinkedList_Cycle.py) |
+| 6 | [Palindrome LinkedList](https://leetcode.com/problems/palindrome-linked-list/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/DataStructure_related/LinkedList/5_Palindrome_LinkedList.py) |