Added a SECURITY readme

Author: mattwoberts

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+The Fider team takes security issues seriously. We appreciate your efforts to responsibly disclose your findings and will make every effort to acknowledge and address security issues promptly.
+
+### How to Report a Security Vulnerability
+
+If you believe you've found a security vulnerability in Fider, please send your report to:
+
+**Email: [email protected]**
+
+### What to Include in Your Report
+
+To help us better understand and address the issue, please include the following information in your report:
+
+- Description of the vulnerability
+- Steps to reproduce the issue
+- Potential impact of the vulnerability
+- Any possible mitigations you've identified
+
+### Response Timeline
+
+We'll acknowledge receipt of your vulnerability report within 4 days and will send you regular updates about our progress.
+
+### No Bug Bounty Program
+
+Unfortunately, we do not offer monetary rewards or bounties for vulnerability reports at this time.