chore: add security.md

SECURITY.md

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+# Security Policy
+
+## ⚠️ Reporting a Vulnerability
+
+To report a vulnerability, please send an email to [[email protected]](mailto:[email protected]) or submit it for a bounty via [Huntr](https://huntr.dev/bounties/disclose/?target=https://github.com/unjs/ufo).
+
+All security vulnerabilities will be promptly verified and addressed.
+
+We recommend to regulary upgrade and publish with the latest versions of used packages and sub-dependencies by maintaining lock files (`yarn.lock`, `package-lock.json` and `pnpm-lock.yaml`) in order to ensure your application remains as secure as possible.