Create README.md

Adding a dataset card for the prediction market data

README.md

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+---
+language:
+- en
+---
+This is a dataset with trades made on the [*Omen*](https://omen.eth.link/) platform by automated [trading agents](https://github.com/valory-xyz/trader-quickstart). 
+There different files are generated from this [public repository](https://github.com/valory-xyz/scripts).
+
+# Files
+- `all_trades_profitability.csv` 
+This is the "prediction market data" dataset created by the profitability python script with trading data by trader and bet, including wins at trade level and roi among other information. Size: 72742 rows.
+
+- `delivers.csv`
+These are the mech deliveries obtained from querying the mech subgraph (link to the mech subgraph).
+
+- `fpmmTrades.csv`
+This is a data collection obtained by querying the [Omen subgraph](https://api.thegraph.com/subgraphs/name/protofire/omen-xdai) which contains information of the bets made by each trader. 75274 rows
+
+- `fpmms.csv`
+These are the open markets data in Omen.
+
+- `requests.csv`
+These are the mech requests obtained from querying the [mech subgraph] (https://valory-workspace.slack.com/archives/D06SK6KT5U1/p1713523649613809).
+
+- `summary_profitability.csv`
+This is also trading data information but aggregated resulty by trader.
+
+- `tools.csv`
+This is information about the requests made to the mech tools used for the different bets done by the traders. It captures the error rate as well as accuracy (wins) info.