Create SECURITY.md (#3968)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We publish releases monthly.
+
+| Version  | Supported          |
+| -------  | ------------------ |
+| >= 1.4.4 | :white_check_mark: |
+| < 1.4.4  | :x:                |
+
+## Reporting a Vulnerability
+
+https://github.com/zeromicro/go-zero/security/advisories
+
+Accepted vulnerabilities are expected to be fixed within a month.