Add security policy

security.md

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+# Security
+
+## Reporting Security Issues
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+Instead, please open a [security advisory][advisory] to notify the maintainers. You should receive a response within 3 working days. If for some reason you do not, please follow up via email to ensure we received your original message.
+
+Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
+
+  * Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
+  * Full paths of source file(s) related to the manifestation of the issue
+  * The location of the affected source code (tag/branch/commit or direct URL)
+  * Any special configuration required to reproduce the issue
+  * Step-by-step instructions to reproduce the issue
+  * Proof-of-concept or exploit code (if possible)
+  * Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.
+
+If you find a vulnerability anywhere in this project, such as the source or scripts,
+then please let the maintainers know ASAP and we will fix it as a critical priority.
+
+[advisory]: https://github.com/pgcentralfoundation/pgrx/security/advisories/new