add a description of the test datasets

[eparejatobes]

• [ ] which kind of data, community composition, etc
• [ ] minimal discussion of the results: accuracy, time, ...
• [ ] Explain how this is part of the release process

[marina-manrique]

We have to include as well the reference to the datasets themselves (SRA ERX IDs)

[laughedelic]

who's assigned?

[marina-manrique]

Me, I guess. I'm working on this tomorrow morning