Merge pull request #443 from sul-dlss/items_only_info

Add note about items_only.csv

source_data/README.md

@@ -2,6 +2,8 @@
 ## data sources
 ### items_only.csv
 This file is a flat list of all items in the data (no series, subseries, etc.) that was generated by combining excel sheets provided by ICJ and remediated using OpenRefine. A copy of it is uploaded to Google Drive.
+
+It's worth noting that `items_only.csv` is also being used as a source for uploading data into SDR at the item level, though that is adjacent to the application itself.
 ### aspace_uploader.xlsx
 The Excel upload template provided by the ArchivesSpace uploader plugin developers for uploading archival objects. Not used, but provided for reference.
 ### aspace_headers.xslx