Create SECURITY.md

Author: zinja-coder

SECURITY.md

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+# Security Policy
+---
+### Reporting a Vulnerability
+
+To report a security issue, please open a new [security advisory](https://github.com/zinja-coder/jadx-ai/security/advisories). Please fill the steps you took to create the issue, affected versions, and, if known, mitigations for the issue. We will check and respond within 3 working days. If the issue is confirmed as a vulnerability, we will apply required mitigations at the next release.