doc: add minimal SECURITY md

[RafaelGSS]

As discussed in https://openjs-foundation.slack.com/archives/C09EXEEHFKP/p1757790176003369

I believe the SECURITY.md from nodejs/.github isn't really applicable to a Node.js website, so it might be better to refer to the minimal security md defined in OpenJS Projects: openjs-foundation/cross-project-council#1588.

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Project	Deployment	Preview	Updated (UTC)
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.55%. Comparing base (6cabc97) to head (f100248).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8171   +/-   ##
=======================================
  Coverage   76.55%   76.55%           
=======================================
  Files         115      115           
  Lines        9602     9602           
  Branches      323      323           
=======================================
  Hits         7351     7351           
  Misses       2250     2250           
  Partials        1        1           

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[avivkeller]

cc @nodejs/web

@RafaelGSS can you add @nodejs/security-wg as a codeowner in the CODEOWNERS?

[AugustinMauroy]

LGMT !

[github-actions]

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