Create SECURITY.md

Author: castengine

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The table below outlines which versions of `insert-tools` are currently supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.x     | :white_check_mark: |
+| 0.x     | :x:                |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please open a confidential issue or email us at **security@castengine.dev** (replace with your preferred contact).
+
+We aim to:
+- Acknowledge receipt within 48 hours
+- Investigate the issue promptly
+- Keep you updated during the process
+- Credit you if desired once resolved (optional)
+
+Thank you for helping us keep the project secure!