Create SECURITY.md (#443)

## Fixes
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## Changes
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## Checklist
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- [ ] 🤖 This change is covered by unit tests (if applicable).
- [ ] 🤹 Manual testing has been performed (if necessary).
- [ ] 🛡️ Security impacts have been considered (if relevant).
- [ ] 📖 Documentation updates are complete (if required).
- [ ] 🧠 Third-party dependencies and TPIP updated (if required).

Author: soumeh01

SECURITY.md

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+# Security  
+
+For reporting security issues, please follow the official guidelines outlined in [SECURITY.md](https://github.com/Open-CMSIS-Pack/cmsis-toolbox/blob/main/SECURITY.md).