Tag release and register this package

[ufechner7]

This is already a very good and well documented package. It would be nice if it could be installed by
] add ControlSystemIdentification
Thank you!

[baggepinnen]

Thanks! JuliaLang/METADATA.jl#22708
Registration PR submitted

[baggepinnen]

This package is now registered! Given the current slight chaos in the rigistration process, perhaps it will take a while before it installs properly, but at least it should sooner or later.

[ufechner7]

Thank you! :)