Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following chart shows versions of `django-helpdesk` that are currently receiving bugfixes and security patches.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.3.x   | :white_check_mark: |
+| 0.2.x   | :white_check_mark: |
+| < 0.2   | :x:                |
+
+## Reporting a Vulnerability
+
+If you believe you have discovered a bug impacting security in a supported version, please DO NOT file a Issue / Bug Report for it publicly.
+
+Instead, please send details to <garret@wassiverse.com>. Please be sure to include "django-helpdesk security issue" in the subject line for fastest response.
+
+Once reported, we'll be in touch to confirm the issue and work toward releasing a patch as soon as possible.
+
+After a patch has been released, a new release will be tagged and uploaded to PyPi, etc. At that time, details of the issue will be announced publicly.
+
+Users are always highly encouraged to upgrade to the latest bugfix release as soon as possible.