docs: Add security policy

Closes #276

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Most recent release.
+
+## Reporting a Vulnerability
+
+Please report any security issues you discovered to meltyshev@gmail.com. If the issue is confirmed, we will release a patch as soon as possible depending on complexity.
+
+**Do NOT create public issues on GitHub for security vulnerabilities.**
+
+Thank you for your contribution!