Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 7.x.x   | :white_check_mark: |
+| < 7.0.0 | :x:                |
+
+## Reporting a Vulnerability
+
+Please don not share vulnerabilities publicly in GitHub or other platforms.
+You can report security issues by sending a email to `security@abp.io`
+Your report is immediately evaluated. We publish patch versions for critical vulnerabilities in a week at most.