Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+For security patches, the latest release is supported:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, [create an issue](https://github.com/go-test/deep/issues) with the _security_ label.
+
+This project is developed and maintained by volunteers during their free time,
+so there is no SLA or ETA for fixing vulnerabilities (or any issues).
+Please help by submitting a PR to fix an issue.