chore: add security policy file SECURITY.md (#633)

jackwotherspoon · web-flow · commit 28a7378fb818 · 2023-02-21T14:37:28.000-05:00
diff --git a/SECURITY.md b/SECURITY.md
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+# Security Policy
+
+To report a security issue, please use [g.co/vulnz](https://g.co/vulnz).
+
+The Google Security Team will respond within 5 working days of your report on [g.co/vulnz](https://g.co/vulnz).
+
+We use [g.co/vulnz](https://g.co/vulnz) for our intake, and do coordination and disclosure here using GitHub Security Advisory to privately discuss and fix the issue.
