I want to add DeQueue.java for the implementation of Dequeue

[amansinghrajpoot]

I want to add a Dequeue implementation in Java/DataStructures/Queues/

[Darshanpawar005]

I will look up for that.

[amansinghrajpoot]

I have created a pull request for the DeQueue.java

[stale]

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[stale]

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