Create security.md

Author: tomhollingworth

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+These versions are currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x.x   | :white_check_mark: |
+| 1.x.x   | :x:                |
+
+## Reporting a Vulnerability
+
+Minor vulnerabilities can be reported as [issues](https://github.com/Spruik/PackML-MQTT-Simulator/issues). For major or servere vulnerabilities either contact [tomhollingworth](mailto:[email protected]) directly, or raise an [issue](https://github.com/Spruik/PackML-MQTT-Simulator/issues). Turn around time for accepted security fixes are up to 2 weeks, with most completed within 3 days of reporting.