Create SECURITY.md

Author: allmightyspiff

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Generally only the latest release will be actively worked on and supported. 
+Version 5.7.2 is the last version that supports python2.7.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.9.x   | :white_check_mark: |
+| 5.7.2   | :white_check_mark: |
+| < 5.7.2 | :x:                |
+
+## Reporting a Vulnerability
+
+Create a new [Bug Report](https://github.com/softlayer/softlayer-python/issues/new?assignees=&labels=Bug&template=bug_report.md&title=) to let us know about any vulnerabilities in the code base.