chore: add security policy

SECURITY.md

@@ -0,0 +1,17 @@
+# Security Policy
+
+## Supported Versions
+
+As long as intercepts is at major version 0, only the most recent minor version will be supported.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.4.x   | :white_check_mark: |
+| < 0.4   | :x:                |
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities by creating a draft [security advisory](https://github.com/dlshriver/intercepts/security/advisories/new) on GitHub.
+The submitted draft security advisory will only be visible to the maintainers of the project and invited collaborators.
+A maintainer will send you a response indicating the next steps in handling your report, and will keep you informed of the progress towards a fix and announcement.
+At any point you may be asked for additional information.