📝 notes/guidance for security policy [due Oct 11]

voting group: @commonhaus/cf-egc

Do one of the following:

React with 👍 (:+1:) or Approve a review if it looks good to you
React with 👀 (:eyes:) if you're "ok" with it (it may not be your favorite)
If you think it needs discussion or revision:
- Create a review, add your comments and require changes
- Use the +- button to make a suggestion (instead of just adding a comment).