Added security

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+At the moment Spin is only supported to the very latest commit. We combine that with our fast response to incidents, so risk is minimized.
+
+| Version        | Supported          |
+|:-------------- |:------------------ |
+| main           | :white_check_mark: |
+| other commits  | :x:                |
+
+## Reporting a Vulnerability
+
+
+**Do not open an issue or Pull Request directly**, because it might reveal the vulnerability.
+
+If you have a vulnerability to report, please follow [our responsible disclosure policy](https://www.notion.so/Responsible-Disclosure-Policy-421a6a3be1714d388ebbadba7eebbdc8).