Update README.md

The dataset sourced from [HRDE](https://github.com/hush-cd/HRDE/tree/main)

Citation
```


@misc
{chen2024hrderetrievalaugmentedlargelanguage,
title={HRDE: Retrieval-Augmented Large Language Models for Chinese Health Rumor Detection and Explainability},
author={Yanfang Chen and Ding Chen and Shichao Song and Simin Niu and Hanyu Wang and Zeyun Tang and Feiyu Xiong and Zhiyu Li},
year={2024},
eprint={2407.00668},
archivePrefix={arXiv},
primaryClass={cs.CL},
url={https://arxiv.org/abs/2407.00668},
}
```

README.md

@@ -1,3 +1,13 @@
----
-license: apache-2.0
----
+---
+license: apache-2.0
+task_categories:
+- question-answering
+language:
+- zh
+tags:
+- rumor
+- health
+- medical
+size_categories:
+- 1M<n<10M
+---