Add a license

[clhunsen]

After watching the presentation on open-source licenses in the seminar this week, I remembered that we still lack a license in the network-library project.

I propose GPL v2 as a license to be in compliance with Codeface, on which we basically build and which is our main data source.

Any thoughts on that?

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Note to self: In the end, we need the permission from every contributor to add the license.

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• https://choosealicense.com/licenses/gpl-2.0/
• https://github.com/siemens/codeface

[clhunsen]

• [x] @hechtlC
• [x] @bockthom
• [x] @sofie-kemper
• [x] @flx5
• [x] @Roger1995
• [x] @ferdinandfrank
• [x] @clhunsen

[clhunsen]

With version v3.1, we now have GPLv2 as license. :grinning: