docs: add notes about reporting security issues (nuxt#4895)

Co-authored-by: Daniel Roe <[email protected]>

Author: pi0

Diff for: SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please send an email to **[email protected]** or submit it for a bounty via [Huntr](https://huntr.dev/bounties/disclose/?target=https://github.com/nuxt/framework).
+
+All security vulnerabilities will be promptly verified and addressed. 
+
+While the discovery of new vulnerabilities is rare, we also recommend always using the latest versions of Nuxt and other 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.
+