Choose license and add license header to files

[rfuehrer]

A license must be selected and added to the repository as a LICENSE. If no license is specified, the use for other uses is not obvious. Once a license has been selected, the files should - where possible - be supplemented with the license header.

If the development is original, Generali AG can be specified in the license. If not, a reference to the original repo must be included in the README and the upstream license must be considered.

[rfuehrer]

If there is an upstream to the project, the repository should be set up as a fork, if necessary, or at least a reference should be given in the README (credits)