chore: Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Branch `main` is currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| main    | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+This project is intended to be a starting point for development of Jenkins shared library and pipelines.
+It uses Jenkins core and plugins, Spock testing framework and JenkinsPipelineUnit as its dependencies
+and most probably does not introduce its own vulnerabilities.
+
+Still, in case if you found a vulnerability introduced by the code of this project, please kindly report it
+to [email protected]