Create SECURITY.md

Author: jsjoeio

docs/SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Only the latest version of `code-server` is currently support with security updates. These security updates will be patched in the version after the current version.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.9.3   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please send an email to security[@]coder.com and our security team will respond to you.