Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Security vulnerabilities may be reported on any version, and your reports
+are greatly appreciated. Patches may be released for the current major
+version, and the previous major version.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.1.x   | :white_check_mark: |
+| 0.1.15  | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+You are welcome to report a security vulnerability by opening a GitHub
+issue, or if it feels more appropriate, you may send an email to
+<a href="mailto:joshooaj@gmail.com?subject=SECURITY DISCLOSURE">joshooaj@gmail.com</a>
+with "SECURITY DISCLOSURE" in the subject.
+
+I will make an effort to address the issue within 30 days. If you are able
+to provide sample code to demonstrate the issue, or submit a pull request
+with your proposed fix, that would be a great help.