Create SECURITY.md

Author: 梶塚太智

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a potential security vulnerability in the Stack Programming Language project, please follow these steps to report it:
+
+1. **Do not create a public GitHub issue.**
+
+2. Send a private email to [[email protected]](mailto:[email protected]) with the subject "Security Vulnerability in Stack Programming Language."
+
+3. Include a detailed description of the vulnerability, steps to reproduce it, and any related information.
+
+4. Our security team will acknowledge your email within [timeframe] and work with you to address the issue.
+
+## Security Response
+
+- The security team will respond to your report promptly.
+
+- Once the issue is confirmed, the team will work on a fix.
+
+- A security advisory will be published on our GitHub repository.
+
+Thank you for helping to keep Stack Programming Language secure!