Add Josephus Problem in Ruby

[AAshGray]

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I Am Adding a New Code Snippet in an Existing Language

• I fixed Add Josephus Problem in Ruby #4467
• I did not include any extra folders/libraries
• I named the pull request using Add {PROJECT} in {LANGUAGE} format

[github-actions]

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Thanks for your help!

[Kaamkiya]

You seem to validate numbers by checking that there are no letters in the input. But what if there are other characters, like $ or ;?

Please account for this, and I'll look at it again.

Thanks :)

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[Kaamkiya]

Thanks! Merging now.