[Java] leetcode #442

[aayush26]

https://leetcode.com/problems/find-all-duplicates-in-an-array/

[mariojp]

Solution Sent

[aayush26]

@mariojp Thanks. Merged.

[kushverma86]

working on this

[kushverma86]

done please review my pr

[ichromanrd]

This issue should be close now since it has been merged