Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We only support the latest major version of our extensions actively. I.e., you can use previous major versions if you are happy with their functionality. However, if you report a problem or request additional features,
+we will only fix issues and add features to the latest major version of our extensions.
+
+## Reporting a Vulnerability
+
+If you believe you have found a security issue with one of our extensions, feel free to report it via email to mailto:[email protected] or report it [here](https://github.com/MicrosoftPremier/VstsExtensions/security/advisories/new).