Feature/#19 mirror and license
Summary
This MR provides a license file. The license has been proposed by Mustafa and Tine, please see if you agree.
Since it is necessary for the master branch, too, I'll add a separate MR for this.
Use Cases
Anyone who wants to reuse the software needs terms for this.
Documentation
Are there parts of the documentation we have to adjust
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Yes, and I already did!
Changelog
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I added a statement to the CHANGELOG.