Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please [privately report it via the Security tab](https://github.com/intlify/vue-i18n/security/advisories/new) on the correct GitHub repository (see [documentation](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability#privately-reporting-a-security-vulnerability)). If that is impossible, feel free to send an email to [email protected] instead.
+
+All security vulnerabilities will be promptly verified and addressed.