Merge pull request #9858 from wmontwe/docs-add-threat-modeling-guide

docs: add threat modeling guide

Author: wmontwe

docs/SUMMARY.md

@@ -50,6 +50,8 @@ generator, in this case, **mdbook**. It defines the structure and navigation of
   - [Release Automation](ci/AUTOMATION.md)
   - [Developer Release Checklist](release/developer-checklist.md)
   - [Manual Release (historical)](ci/HISTORICAL_RELEASE.md)
+- [Security]()
+  - [Threat Modeling Guide](security/threat-modeling-guide.md)
 
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