fix: add SECURITY.md to resolve Allstar policy violation

SECURITY.md

@@ -0,0 +1,33 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in this project, please report it responsibly.
+
+**Do not open a public GitHub issue for security vulnerabilities.**
+
+Instead, please report vulnerabilities by emailing the repository maintainers or by using [GitHub's private vulnerability reporting](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability).
+
+### What to include
+
+- A description of the vulnerability
+- Steps to reproduce the issue
+- Any potential impact
+- Suggested fix (if available)
+
+### Response
+
+We will acknowledge receipt of your report within 48 hours and aim to provide a resolution or mitigation plan as quickly as possible.
+
+## Supported Versions
+
+This is a community-curated list of prompts. Security policies apply to the repository infrastructure (e.g., CI/CD, dependencies) rather than the prompt content itself.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| latest  | :white_check_mark: |
+
+## Additional Resources
+
+- [GitHub Security Advisories](https://docs.github.com/en/code-security/security-advisories)
+- [Google Open Source Security](https://opensource.google/documentation/reference/security)