The CSVReader is not a class that is part of screen-scraper but is very useful and well put together. We have used it extensively. It is part of the opencsv package which actually holds the under pinnings of our own CsvWriter. As it is not a class that we maintain we will not document the methods in case they change without our notice but we invite you to look over how to use it in their API or brief documentation.
To use the CSVReader simply import it in your script, the same as you would any other utility class. The opencsv.jar file is already included in the Professional and Enterprise Editions of screen-scraper's default installation.