chore: add SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following major versions are currently supported with security updates.
+
+| Version                                         | Security Fixes 🔑 |
+| ----------------------------------------------- | ----------------- |
+| [v6.x](https://github.com/panva/jose/tree/v6.x) | ✅                |
+| [v5.x](https://github.com/panva/jose/tree/v5.x) | ✅                |
+| [v4.x](https://github.com/panva/jose/tree/v4.x) | ✅                |
+| [v2.x](https://github.com/panva/jose/tree/v2.x) | ✅                |
+
+## Reporting a Vulnerability
+
+You should report vulnerabilities using the [Github UI](https://github.com/panva/jose/security/advisories/new) or via email [email protected]