Add CodeMeta Data

Bernd Flemischrequested to merge
feature/add-codemeta-data into master

The CodeMeta scheme, https://codemeta.github.io/, can be used for achieving better findability, search queries ... I added a first draft of the relevant file codemeta.json, generated with https://codemeta.github.io/codemeta-generator/.

Edited by Bernd Flemisch

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