[doc] setup security policy (#1024)

Signed-off-by: tomsun28 <tomsun28@outlook.com>

SECURITY.md

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+# Security Policy
+
+**[Version Releases](https://github.com/dromara/hertzbeat/releases)**
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version           | Supported          |
+|-------------------|--------------------|
+| Latest Version    | :white_check_mark: |
+| Any Other Version | :x:                |
+
+## Reporting a Vulnerability
+
+Use this section to tell people how to report a vulnerability.
+
+Please submit your security report by this way [reporting-a-security-vulnerability](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing/privately-reporting-a-security-vulnerability#privately-reporting-a-security-vulnerability)