Create SECURITY.md

Author: sni

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This is an open source project and professional support is available from 
+
+- https://www.consol.com/product-solutions/open-source-monitoring/
+
+Besides that always the last stable release is supported but response is limited due to my spare time.
+
+## Reporting a Vulnerability
+
+Please report securtiy related issues here:
+
+- https://github.com/sni/Thruk/security
+- or by email at security (at) thruk.org