Add ribbon example cells

Add ribbon and proofreading data, and smaller swc file with plotted examples only.

Add skeleton files

Upload Eyewire II Proofread Cells Main List - Cell types and properties 2026-01-23.csv

Upload Movie_tissue-and-overview-supplemental-1.mp4

Create README.md

Upload df_all_neurons_2026-05-15-15h.parquet

initial commit