docs: Add SECURITY.md

SECURITY.md

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+# Security Policy
+
+While WXT is in prerelease, only the latest version will recieve security updates. The latest version is:
+
+<img alt="npm version" src="https://img.shields.io/npm/v/wxt?labelColor=black&color=%234fa048">
+
+<!--
+## 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.
+-->