Add government_contracts.parquet and README.md

README.md

@@ -14,7 +14,7 @@ description: >-
 
 ```python
 from datasets import load_dataset
-df_contracts = load_dataset("sovai/government_contracts", split="train").to_pandas().set_index(["contract_id","date"])
+df_contracts = load_dataset("sovai/government_contracts", split="train").to_pandas().set_index(["ticker","date"])
 ```