Add task category and relevant tags to dataset card

This PR updates the dataset card by adding `task_categories: text-generation` and relevant `tags` (`llm`, `reasoning`, `tool-use`, `mathematics`) to the metadata. These additions improve the discoverability and classification of the dataset on the Hugging Face Hub. The existing Arxiv paper link in the content was intentionally kept as per the instructions, which state there is no need to replace an existing Arxiv link with a Hugging Face paper page link.

README.md

@@ -1,7 +1,14 @@
 ---
-license: apache-2.0
 language:
 - en
+license: apache-2.0
+task_categories:
+- text-generation
+tags:
+- llm
+- reasoning
+- tool-use
+- mathematics
 ---
 
 This is the test dataset for the paper **[Understanding Tool-Integrated Reasoning](https://arxiv.org/abs/2508.19201)**