add README to study

studies/TranscriptomeDataSets/README.md

+# Transcriptome Data Sets
+
+![S2](/_publication/Data%20Sheet%202/S1.jpg)
+
+**Figure S1: Composition of data set**
+
+This study is based on 315 transcriptomes (133 from tomato (a), 182 from potato (b)) and includes
+seven plant pathogen domains (bacteria, fungi, oomycetes, nematodes, viroids, viruses, insects). The
+pathogens include common pests of tomato and potato as well as mycorrhizal forming organisms and
+potential biocontrol agents (green cross/grey text). The pathogens belong to biotrophic (green circle),
+necrotrophic (brown circle), hemibiotrophic (green-brown circle) as well as unknown (grey circle) or
+none categorical (pink circle) pathogens. We included transcriptomes from root, fruit, stem and leaves
+of resistant (shield) as well as susceptible cultivars (crossed-out shield) that were generated at 12
+different time points (0 dpi until the end of the life cycle of the plant). Cultivars ranged from 13 (a) to
+15 (b) per host.
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