No issue - Add Security Policy

Author: michael-82

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Only the most recent major version is regularly updated and receives security fixes.
+
+## Reporting a Vulnerability
+
+Please use the project's [private vulnerability reporting feature](https://github.com/medizininformatik-initiative/feasibility-backend/security/advisories)
+to report any vulnerabilities. For more information, see <https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing/privately-reporting-a-security-vulnerability>