Update README.md

README.md

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 license: apache-2.0
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+These csv files contain a single column, 'transcript', with simple PGN string gam transcripts. The data is sources from Lichess: https://database.lichess.org
+All files contain some very short and very long games; I recommend filtering these, depending on your use case.
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+All files are filtered to include white wins only.
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+According to the Lichess ELO ratings saved with the game data, which typically run a little high, the files contain games filtered:
+stable.csv, 24M games: White 1300-2300, Black 1300-2600
+anneal.csv, 3.9M games: White 1900-2300, Black 1300*-2700. Includes some lc0-vs-lc0 and stockfish-vs-stockfish games within that range (possibly a little lower in the case of some lc0 games, but probably not given Lichess' high ratings...)
+stable2.csv, 57.7M games: White 1500-2400, Black 1400-2800
+anneal2.csv, tbdM games: White 2000-2500, Black 1500-3000