Add Ruby config in .editorconfig

[aashutoshrathi]

This issue is about Enhancements.

• [ ] Issue Title is in form Algo/DS Name [Language].
• [x] I searched or browsed the repo’s other issues to ensure this is not a duplicate.
• [ ] This Algo/DS is worth adding to this repository.
• [x] Assign this issue to me (I want to work on this).
  • [x] I ensure that I am not already assigned to 2 or more issues.
• [x] I will send my PR only after I'm assigned to this issue by any maintainer.
• [x] I understand that I will be unassigned from this issue if I fail to send a PR for this within a week.

[singhpratyush]

The contributors most likely able to help are:

@aashutoshrathi

Possible duplicate or related issues are:

• #428: Add badges to README.md
• #459: Adding C# section in .editorconfig

[singhpratyush]

Please add it in #514.

[nlok5923]

If this issue is open then @iiitv/project-maintainers I would like to work on it.

[aashutoshrathi]

Yeah, I guess you can take it.