Add gitmodules

Marius Kriegerowski requested to merge feature/relative-submodules into master

This is about adding the different components of rabotnik-demo into a repository that links them all together.

@marius had problems synchronizing the git submodules and turned out that it's preferred to use relative urls. See e.g.

\approve @fd \fyi @ds @prehn

Edited by Felix Delattre

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