Add references document defining NGF permissions

[sarthyparty]

Proposed changes

Add references document defining NGF permissions

Problem: Users don't know about NGF security and permissions.

Solution: I added a references document that helps with that.

Closes #1985

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.