Update README.md

Author: ehanson8

README.md

@@ -2,5 +2,10 @@
 Scripts for manipulating MARC-related data
 
 #### [extractCompleteNamesSubjectsFromCSV](extractCompleteNamesSubjectsFromCSV.py)
-#### extractMarcFields.py(extractMarcFields.py)
-#### extractUniqueNamesSubjectsFromCSV.py(extractMarcFields.py)
+Categorizes headings depending on the MARC tags used (e.g. 110,610, 710 as corporate names and 100, 600, 700 as personal names) and produces corresponding CSV files.
+
+#### [extractMarcFields](extractMarcFields.py)
+Produces a CSV of selected MARC fields from a JSON file of MARC data produced by [Traject](https://github.com/traject/traject).
+
+#### [extractUniqueNamesSubjectsFromCSV](extractMarcFields.py)
+Deduplicates and categorizes headings depending on the MARC tags used (e.g. 110,610, 710 as corporate names and 100, 600, 700 as personal names) and produces corresponding CSV files.