Add description for use cases

Description should go into the docs. Our paper Theodolite: Scalability Benchmarking of Distributed Stream Processing Engines in Microservice Architectures could provide the basis for these descriptions.

added modul/benchmarks label

added modul/docs label and removed modul/benchmarks label

mentioned in issue #141

changed the description

mentioned in merge request !204 (closed)

assigned to @she

changed milestone to %0.9.0

Some more docs are now provided, so this issue is kind of resolved now.

closed