Add CODE Magazine link to README

[Nolanp123]

Summary of your changes

Description

I added a link to CODE Magazine to the Magazine section of README.md along with a brief description of the magazine.

Checklist

• My change follows the Contributing Guidelines
• I have added only one new link to the list.
• I have checked that the link that I added does NOT exist in the project already.
• I have sorted the link alphabetically under the related section.