docs(security): add markdown file

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+At Seelen UI, we always recommend using the latest available version, as all versions are kept secure and up to date.
+
+| Version  | Support        |
+| -------- | -------------- |
+| Latest   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+If you discover a vulnerability in Seelen UI, we appreciate you reporting it promptly.
+
+### How to Report
+
+- **Email:** Send an email to [[email protected]](mailto:[email protected]).
+- **Discord:** Send a message to the project staff on our official Discord server.
+
+### What to Expect
+
+- **Acknowledgment:** You will receive a confirmation of receipt within 48 hours.
+- **Updates:** We will keep you informed about the status of the investigation and any actions taken.
+- **Resolution:** If the report is accepted, we will work on a solution and implement it in the next update.
+
+Thank you for helping us keep Seelen UI secure for all users.