Update data readme
# Summary statistics of wealth and permanent income in the United States
# TODO
+
+The summary statistics in `WealthIncomeStats.csv` are computed using the
+Survey of Consumer Finances. The file can be replicated directly from the
+unprocessed SCF summary files using the repository [SCF-IncWealthDist](https://github.com/Mv77/SCF-IncWealthDist),
+created by [Mateo Velasquez-Giraldo](https://mv77.github.io/).
