Add missing legal documentation

[SebastianBezold]

The Security information from SECURITY.md is missing for this repository.
This file is required by the Legal Documentation Generator

@bs-jokri could you please have a look at this?

[bs-jokri]

Thanks for pointing this out. Sure we can add. We haven#t done so as the repository only contains model files, which cannot be compiled to running code and hence expose vulnerabilities. For consistency reasons we will add the file.