Create README.md

Author: jrlegrand

csv/README.md

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+# This is the input file folder
+
+Place CSV files (i.e. input.csv) in this folder.
+
+The CSV file should contain a single column with free-text sigs. Do not include a header row.
+
+The output file will be written to the output/ folder within this directory.
+
+The default output file name will be output.csv.