Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Typically, only the latest version of `django-distill` will be supported for
+security issues. Please upgrade to the latest release first before reporting
+any security issues.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.2.4   | :white_check_mark: |
+| < 3.2.4 | :x:                |
+
+## Reporting a Vulnerability
+
+`django-distill` is a static site generator, as such any security issues are
+going to be inherently limited in scope. Please feel free to create a public
+GitHub issue if you encounter any unexpected or potentially security related
+issues.