Update data-library.yaml

Added link to the data file on Zenodo

topics/single-cell/tutorials/scrna-case_trajectories/data-library.yaml

@@ -5,8 +5,16 @@ destination:
   description: Galaxy Training Network Material
   synopsis: Galaxy Training Network Material. See https://training.galaxyproject.org
 items:
-- name: New topic
-  description: Topic summary
+- name: Single Cell
+  description: Training material and practicals for all kinds of single cell analysis
+    (particularly scRNA-seq!). When you generate your lovely gene lists for your cells,
+    consider checking out our Transcriptomics tutorials for further network analysis!
   items:
   - name: Inferring Trajectories using Scanpy
-    items: []
+    items:
+    - name: 'DOI: 10.5281/zenodo.7075718'
+      description: latest
+      items:
+      - url: https://zenodo.org/api/files/4d8b712c-a2d3-4d91-9235-83a913f87936/Final_cell_annotated_object.h5ad
+        src: url
+        ext: h5ad