docs: 添加安全策略

SECURITY.adoc

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+= Security Policy
+
+== Supported Versions
+
+Use this section to tell people about which versions of your project are currently being supported with security updates.
+
+[cols="1,1", options="header"]
+|===
+| Version | Supported
+| 1.4.x   | currently supported
+| 1.3.x   | no  support
+| 1.2.x   | no  support
+| 1.1.x   | no  support
+| 1.0.x   | no  support
+|===
+
+== Reporting a Vulnerability
+
+Use this section to tell people how to report a vulnerability.
+
+Tell them where to go, how often they can expect to get an update on a reported vulnerability, what to expect if the vulnerability is accepted or declined, etc.