Merge pull request #18489 from joelsmith/master

Add repo SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Security Announcements
+
+Join the [kubernetes-security-announce] group for security and vulnerability announcements.
+
+You can also subscribe to an RSS feed of the above using [this link][kubernetes-security-announce-rss].
+
+## Reporting a Vulnerability
+
+Instructions for reporting a vulnerability can be found on the
+[Kubernetes Security and Disclosure Information] page.
+
+## Supported Versions
+
+Information about supported Kubernetes versions can be found on the
+[Kubernetes version and version skew support policy] page on the Kubernetes website.
+
+[kubernetes-security-announce]: https://groups.google.com/forum/#!forum/kubernetes-security-announce
+[kubernetes-security-announce-rss]: https://groups.google.com/forum/feed/kubernetes-security-announce/msgs/rss_v2_0.xml?num=50
+[Kubernetes version and version skew support policy]: https://kubernetes.io/docs/setup/release/version-skew-policy/#supported-versions
+[Kubernetes Security and Disclosure Information]: https://kubernetes.io/docs/reference/issues-security/security/#report-a-vulnerability