Decide what to do with testing data

[tinavisnovska]

Decide whether or not to have test data that mimic a real world example of the data we work with. If keeping them, clarify the description and all that and remove the data description if removing the data from the repo.

[tinavisnovska]

          Will not resolve this completely at the moment, but added as [issue #4](https://github.com/InPreD/samplesheet_generator/issues/4) and will follow up later.

Originally posted by @tinavisnovska in #1 (comment)