Update README.md

README.md

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 AIO (AI王) is a Japanese quiz dataset.
 This repository contains the validation set of Version 2.0, augmented with manually annotated valid answers for each question.
 
-Source: [AI王　〜クイズAI日本一決定戦〜](https://sites.google.com/view/project-aio/home)
+Source: [AI王　〜クイズAI日本一決定戦〜](https://sites.google.com/view/project-aio/dataset)
+
+### Data Fields
+
+- `qid` (`str`): Unique identifier for each entry in the dataset.
+- `competition` (`str`): The name of the competition that the data was first created for.
+- `timestamp` (`str`): The timestamp when the data was created.
+- `section` (`str`): The split the data belongs to.
+- `original_question` (`str`): The original question before any processing or modification.
+- `original_answer` (`str`): The original answer before any processing or modification.
+- `original_additional_info` (`str`): Any additional information provided with the original data.
+- `question` (`str`): The question used for the task.
+- `answers` (`str`): The answer(s) of the question.
 
 
 ### Licensing Information