Create SECURITY.md

Author: ugurcanerdogan

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Security updates are applied only to the most recent releases.
+
+## Reporting a Vulnerability
+
+To securely report a vulnerability, please [submit a new issue on GitHub](https://github.com/Trendyol/kafka-cronsumer/issues/new).
+
+## Vulnerability Process
+
+1. Your report will be acknowledged as soon as possible.
+2. The team will investigate and update the issue with relevant information.
+3. If the team does not confirm the report, no further action will be taken and the issue will be closed.
+4. If the team confirms the report, the team will take action to fix it immediately:
+    1. Commits will be handled in a private repository for review and testing.
+    2. Release a new patch version from the private repository.
+    3. Write a report disclosing the vulnerability.