Create SECURITY.md

Author: wwwillchen

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We will provide security updates for the latest version of Mesop.
+
+## Reporting a Vulnerability
+
+Please [report security vulnerabilities](https://github.com/mesop-dev/mesop/security/advisories/new) via GitHub's [security advisory](https://github.com/mesop-dev/mesop/security/advisories) feature. This allows you to collaborate with the Mesop maintainers privately while the vulnerability is getting fixed. Once the fix is released and the advisory is published, we’ll give you appropriate credit.