Added the sum of Digits in Ruby

[Totakhil21]

Congrats on taking the first step to contributing to the Sample Programs repository maintained by [The Renegade Coder][renegade-coder]!

I Am Modifying an Existing Code Snippet or Existing Tests

Summary
I would like to contribute the Sum of Digits program in Ruby for the Sample Programs repository.

Details

• The program will take an integer as input and return the sum of its digits.
• Example:
  • Input: 1234
  • Output: 10

Checklist

The program will follow the repository contribution guidelines.
The code will be properly formatted and tested before submission.
I will add necessary documentation if required.

Thank you!

[github-actions]

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[rzuckerm]

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