Check how to do the copyright correctly in files

[BirgitBoss]

see comment in https://github.com/admin-shell-io/aas-specs-iec61360/pull/30/files#r1681031851
Shouldn't it be "Copyright (c) 2024" ?

and my comment in https://github.com/admin-shell-io/aas-specs-iec61360/pull/30/files#r1682520291

probably

Copyright (c) 2023-2024 Industrial Digital Twin Association
Copyright (c) 2018-2022 Zentralverband der Elektro- und Digitalindustrie and Plattform Industrie 4.0

see e.g. https://opensource.stackexchange.com/questions/6389/how-do-the-years-specified-in-a-copyright-statement-work#:~:text=In%20the%20case%20of%20open%20source%20projects%2C%20the,commit%20to%20a%20publicly%20visible%20version%20control%20repository.

The year in the copyright notice refers to the year of first publication.
It is a common convention that the notice lists all years where new versions were published.

[twebermartins]

Checking - probably we need also to add the first and last year of publication. Also, the legal entity must be written - e.g., Industrial Digital Twin Association e. V.
Also, we need also to check all other publications.