Add a security policy doc.

elves · Sep 21, 2021 · 1d62b0d · 1d62b0d
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+# Security Policy
+
+## Supported Versions
+
+Only the HEAD and the last release is supported by the developers of Elvish.
+
+However, since some operating systems contain outdated Elvish packages, please
+also feel free to get in touch for security issues in unsupported versions. You
+can check the versions of Elvish packages on
+[Repology](https://repology.org/project/elvish/versions).
+
+## Reporting a Vulnerability
+
+Please contact Qi Xiao at xiaqqaix@gmail.com.