feat(SECURITY.md): Adding security policy

Author: fabnguess

SECURITY.md

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+# Reporting Security Issues
+
+To report a security issue, please [publish a private security advisory](https://github.com/NodeSecure/fs-walk/security/advisories) with a description of the issue, the steps you took to create the issue, affected versions, and, if known, mitigations for the issue.
+
+Our vulnerability management team will respond within one week. If the issue is confirmed as a vulnerability, we will open a Security Advisory and acknowledge your contributions as part of it. This project follows a 90 day disclosure timeline.