Update README with voice file task and new details for S3 data
Update README with voice file task and new details for S3 data

ajb/cityvoice,codeforamerica/cityvoice,codeforgso/cityvoice,ajb/cityvoice,codeforamerica/cityvoice,ajb/cityvoice,daguar/cityvoice,daguar/cityvoice,daguar/cityvoice,codeforgso/cityvoice,codeforgso/cityvoice,codeforamerica/cityvoice,codeforgso/cityvoice,daguar/cityvoice,codeforamerica/cityvoice,ajb/cityvoice