Create SECURITY.md

Author: dbretty

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions of Citrix Optimizer Automation are currently supported for security updates and patches.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2307.003   | :white_check_mark: |
+| 2307.002   | :white_check_mark:                |
+| 2307.001   | :white_check_mark: |
+| < 2307.000   | :x:                |
+
+## Reporting a Vulnerability
+
+If you find a vulnerability in how this PowerShell code can or does operate on a VDI master image please let me know and I will aim to resolve it as soon as possible. 
+
+You can contact me using the details on [https://bretty.me.uk/citrixoptimizerautomation](https://bretty.me.uk/citrixoptimizerautomation)