Create SECURITY.md (lbbrhzn#969)

Author: lbbrhzn

SECURITY.md

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+# Security Policy
+
+This integration is intended for personal use only.
+The integration supports secure connections, but does not perform any validation of client connections.
+
+## Reporting a Vulnerability
+
+Reporting a vulnerability can be done by creating an issue at:
+](https://github.com/lbbrhzn/ocpp/issues)https://github.com/lbbrhzn/ocpp/issues