[CNCFSD-2842] Docs assessment for Radius project

[nate-double-u]

https://cncfservicedesk.atlassian.net/browse/CNCFSD-2842

Radius has asked for help with their documentation.

First steps:

• Read Sandbox Project Documentation Primer
• Attend monthly Tech Writers Open Office Hours

The team will work with Radius to see what work is needed and support.