Create SECURITY.md

Author: ezTxmMC

SECURITY.md

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+# Security Policy
+
+## 📬 Reporting a Vulnerability
+
+If you discover a security vulnerability in **nexonet**, please report it **privately and responsibly**.
+
+**Do not** open public issues or pull requests for security-related matters.
+
+Instead, please contact us directly via:
+
+- 🔐 GitHub Security Advisories: [Create a private advisory](https://github.com/Nexoscript/nexonet/security/advisories/new)
+
+Please include as much detail as possible, including:
+
+- A clear description of the issue
+- Steps to reproduce (proof of concept if possible)
+- Potential impact
+- Suggested fix or mitigation (if known)
+
+We aim to respond within **7 business days** and resolve verified issues as quickly as possible.
+
+## 🔒 Supported Versions
+
+| Version    | Supported |
+| ---------- | --------- |
+| `0.1.x`    | ✅ Yes    |
+
+## 🙏 Responsible Disclosure
+
+We strongly encourage responsible disclosure practices. By reporting security issues privately, you help us protect users and deploy safe fixes quickly.
+
+Thank you for helping make Nexonet more secure!