Update README.md

Author: ehanson8

README.md

@@ -30,3 +30,7 @@ This GET script retrieves specific properties, including proprerties that have a
 
 #### [searchArchivalObjectsByResource.py](/searchArchivalObjectsByResource.py)
 A GET script to extract all of the archival objects associated with a particular resource. To set the resource you want to search for, adjust the 'resourceNumber' variable on line 13
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+#### [postContainersFromCSV.py](/postContainersFromCSV.py)
+This script works to create instances (consisting of top_containers) from a separate CSV file. The CSV file should have two columns, indicator and barcode. The directory where this file is stored must match the directory in the filePath variable. The script will prompt you first for the exact name of the CSV file, and then for the exact resource or accession to attach the containers to.
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