Describe your change:

This adds a double ended queue (deque) to the data structures under queues. A deque is effectively a doubly-linked list/queue/stack combination that only allows adding, removing, and peeking from the beginning and end. Because of the name, I chose to put this in the queue section (I don't believe it is large/important enough to warrant its own section)

• Add an algorithm?
• Add a data structure?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

References

Checklist:

• I have readCONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Java files are placed inside an existing directory.
• All filenames are in all uppercase characters with no spaces or dashes.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message containsFixes: #{$ISSUE_NO}.