Add Zebra Puzzle exercise

[fpsvogel]

Forum thread: https://forum.exercism.org/t/add-zebra-puzzle-exercise-48in24/10368

Note that I've disabled a RuboCop rule in part of the example solution. LMK if that's something we should avoid.

[github-actions]

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[fpsvogel]

Sorry if the force push was badly timed! I didn't realize the PR was reopened already.

I didn't actually make any changes from when I submitted the PR. I only cleaned up the commit history to simplify it.

[kotp]

Force push on your own branch is appropriate, so no worries about the timing there.