Create SECURITY.md

Author: jasonkarns

docs/SECURITY.md

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+<!--
+This is a default security policy that applies to the entire testdouble organization.
+It may be overridden by a repo-specific security policy.
+https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/creating-a-default-community-health-file
+-->
+
+# Security Policy 🛡️
+
+## ✅ Supported Versions
+
+Only the greatest published version (according to SemVer) will be supported.
+This version will be indicated as the "Latest Release" on GitHub Releases. :octocat:
+
+## ⚠️ Reporting a Vulnerability
+
+Use GitHub's built-in reporting mechanism for disclosure.
+Go to the Security tab -> Report a vulnerability.