Docs: Create SECURITY.md

Author: rxaviers

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+Thank you for taking your time to report a globalize.js secutiry vulnerability. Please, we kindly ask you to report it via https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing/privately-reporting-a-security-vulnerability.