Added docker, see RAGeneratorDocumentation.adoc

[ahege]

Signed-off-by: ahege a.hege@rac.de

Reference to a related issue in the repository

See #160

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See #160

Check the checklist

• [x] My code follows the contributors guidelines of this project.
• [x] I have performed a self-review of my own code.
• [ ] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [x] New and existing unit tests / travis ci pass locally with my changes.