Add info on typical data preparation workflow (download dicom [if needed], conversion to BIDS [if needed], selection of BIDS subjects, building of datalad repo cascade, anonymization)

[djoerch]

• [ ] typical workflow
  • [ ] 1. dicom [if needed]
  • [ ] 2. bidscoin [if needed]
  • [ ] 3. selection of BIDS subjects
  • [ ] 4. build datalad repo cascade [including early anonymization for potential computation on scinet]
  • [ ] 5. approach for generating derivatives from different pipelines [expand on datalad cascades]