Create or obtain an example .msp file with training data

[raar1]

For testing and developing the pipeline, it would be useful to have some training set data encoded in "standard" .msp format. This would be, essentially, the retention time and spectral information for as any different sequences as possible. The sequence can be encoded using PEPSEQ (or something similar) in the metadata for each entry.

Perhaps we can get something like this from @tvpham ?