Add submission link

https://leetcode.com/submissions/detail/602549296

Author: anitsh

src/leetcode/datastructure/containsduplicate/two/README.MD

@@ -174,5 +174,5 @@ processed.
 
 Runtime: 44 ms, faster than 21.07% of Java online submissions for Contains Duplicate II.
 Memory Usage: 61.3 MB, less than 26.38% of Java online submissions for Contains Duplicate II.
-
+https://leetcode.com/submissions/detail/602549296