Add security policy documentation

Author: DebaA17

SECURITY.md

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+# Security Policy
+
+If you discover any security vulnerability in this project, please report it to:
+
+**Email:** forensic@debasisbiswas.me
+
+We appreciate responsible disclosure and will respond promptly to any reports.
+
+## Supported Versions
+
+Only the latest version is actively supported for security updates.
+
+## Reporting Guidelines
+- Provide a detailed description of the issue.
+- Include steps to reproduce if possible.
+- Do not disclose vulnerabilities publicly until they are resolved.
+
+Thank you for helping keep this project secure!