doc: add SECURITY.md

Author: caozhuozi

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+We're extremely grateful for security researchers and users who report vulnerabilities they discovered in modelpack.
+All reports are thoroughly reviewed and investigated.
+
+### When Should I Report a Vulnerability?
+
+You should report if:
+
+- You think you have discovered a potential security vulnerability in modepack
+- You are uncertain about the security impact of an issue you found in modelpack
+
+### How to Report a Vulnerability?
+
+Please report a vulnerability using GitHub’s [Security Advisories](https://github.com/modelpack/community/security).
+**Do not create a public issue, pull request, or discussion**.
+
+To submit a report, navigate to the community repository's main page, open the **Security** tab, select **Advisories** from the sidebar,
+click **Report a vulnerability**, provide the required details, and submit.
+This process will create a private advisory visible only to the maintainers for review.
+
+### Security Vulnerability Response
+
+Our maintainers will review and respond to your report within **5 working days**. Depending on the severity and complexity of the issue, resolution times may vary, but we will keep you informed throughout the process.
+
+### Supported Versions
+
+We only provide security fixes for the latest major version.
+
+| Version       | Security Fixes Provided |
+|---------------|-------------------------|
+| `@latest`     | Yes                     |
+| Older versions| Not Guaranteed          |
+
+### Public Disclosure Timing
+
+The disclosure date will be agreed upon between the modelpack maintainers and the reporter.  
+In general:
+
+- Immediate disclosure may occur if the issue is already public.  
+- For vulnerabilities with straightforward fixes, disclosure is typically within **7 days** of the report.  
+- For complex issues requiring more time to investigate and validate fixes, disclosure may be delayed—up to a maximum of **90 days**.  
+
+Delays may also be necessary if the bug or fix is not yet fully understood or adequately tested.