Update README.md

added 2nd program

Author: ecevinoth

README.md

@@ -1,7 +1,11 @@
 # Python-DataStructure-and-Algorithm
-
-
-linkedlist_nth_to_lastnode.py
-
+## linkedlist_nth_to_lastnode.py
 Q: find the nth element from last node of a given linked list. 
 If nth value is greater than given linked list then through back LookupError.
+
+## LinkedList_CycleCheck.py
+Q: check for cycle in give given linked list if exist return True else False.
+  - 1 --> 2 --> 3 --> 1
+  - __True__
+  - 1 --> 2 --> 3 --> None
+  - __False__