Add practice exercise Rail Fence Cipher

I am not exactly sure about the UUIDs in tests.toml…

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You should be able to use the configlet tool to fill those out.

See Configlet | Exercism's Docs

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@klimkin We also have documentation on the structure of practice exercises: Practice Exercises | Exercism's Docs

The configlet tool also has a create command to help create a new exercise: configlet create | Exercism's Docs

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