Add lobbying_data.parquet and README.md

README.md

@@ -13,7 +13,7 @@ description: >-
 
 ```python
 from datasets import load_dataset
-df_lobbying = load_dataset("sovai/lobbying_data", split="train").to_pandas().set_index(["organization","date"])
+df_lobbying = load_dataset("sovai/lobbying_data", split="train").to_pandas().set_index(["ticker","date"])
 ```