Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions are supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.x     | :white_check_mark: |
+| 3.1.x   | :white_check_mark: |
+| < 3.1   | :x:                |
+
+## Reporting a Vulnerability
+
+Report vulnerabilities on the GitHub Security tab: https://github.com/chrisvest/stormpot/security
+
+Vulnerability discussion and fixing will be done through the GitHub interface and tools.
+
+Note, this is for the most part a one-person project.
+I may be slow to respond.