Add Palindromic Number in Ruby

[msj4]

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I Am Adding a New Code Snippet in an Existing Language

• [x] I fixed #3865
• [x] I named the pull request using Add {PROJECT} in {LANGUAGE} format

[msj4]

Thanks for your contribution @msj4 . In the future, please make sure the title of the PR is Add {PROJECT} in {LANGUAGE}.

noted, will do Boss.