Feature/add security policy (#4363)

* Add security policy

SECURITY.md

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+# Security Policy
+
+## Reporting Security Issues
+
+If you discover a security vulnerability in this repository, please report it to security[at]ghostfol.io. We will acknowledge your report and provide guidance on the next steps.
+
+To help us resolve the issue, please include the following details:
+
+- A description of the vulnerability
+- Steps to reproduce the vulnerability
+- Affected versions of the software
+
+We appreciate your responsible disclosure and will work to address the issue promptly.