doc: add RaisinTen as a triager

I would like to apply for the role of a triager in this project. My motivation to become a triager is to help with the issues in this repo and the help repo, as well as learn deeper internals of Node.js, and to eventually become a collaborator! I hearby declare that I have read and understood the Code of Conduct of the project and will adhere to that.

Checklist

• documentation is changed or added
• commit message follows commit guidelines