Add reference data to help first-time user to get started

[524D]

To help new users to get started with CompareMS2, there should be a way to obtain test/reference data in a simple way.

Maybe one could bundle reference data with the compareMS2 utility in a Docker container to mimic the spectra2species server? Or just provide everything together in a zip file?

Originally posted by @magnuspalmblad in #50

Or build in functionality in compareMS2 to retrieve reference data. We could maintain a directory of reference data sets (defined collections, e.g. for pathogens, cell lines, fish species, cats or whatever) that compareMS2 can then download in the correct format and place in the correct location for compareMS2 to find them?

_Originally posted by @magnuspalmblad in [#50](#50 (comment)