Create SECURITY.md

Relates to #1136

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.x.x   | :white_check_mark: |
+| < 1.0   | :x:                |
+
+## Reporting a Vulnerability
+
+To report a security vulnarability, email [contact@vendure.io](mailto:contact@vendure.io).