[docs] Add security reporting documentation (#3120)

Author: matrixsparse

website/community/security.md

@@ -0,0 +1,14 @@
+---
+title: Security
+sidebar_position: 8
+---
+
+# Security
+
+## Reporting Security Issues
+
+If you have concerns regarding Fluss's security or discover a vulnerability or potential threat, please contact the Apache Security Team by sending an email to **security@apache.org**. 
+
+In the email, specify the project name **Fluss** and include a description of the issue or potential threat. You are also encouraged to include steps to reproduce the issue. The security team and the Fluss community will get back to you after assessing and analyzing the findings.
+
+**PLEASE PAY ATTENTION** to report the security issue privately to **security@apache.org** before disclosing it publicly.