Add catalog xlsx US/DDC_CWICR_USA_USD_Catalog.xlsx (fetched from GH LFS)

Add readme-txt US/README_DDC_CWICR_TABULAR_USA_USD.txt

Add readme-md US/README.md

Add US/USA_USD_workitems_costs_resources_DDC_CWICR.parquet

Add US/DDC_CWICR_USA_USD_Catalog.csv