Add task category, license and paper metadata

Hi there! I'm Niels from the community science team at Hugging Face.

This PR improves the dataset card by adding relevant metadata to the YAML header:
- **Task Category**: Categorized under `text-generation` (which covers code completion/generation).
- **License**: Explicitly tagged as `mit` based on the information in the README.
- **Arxiv ID**: Added the `arxiv` tag (`2508.02455`) to link this repository with the Hugging Face paper page, allowing users to easily find the research behind the data.
- **Tags**: Added language and domain tags for better discoverability.

The existing Markdown content remains unchanged as it is already quite comprehensive.

README.md

@@ -1,4 +1,13 @@
 ---
+license: mit
+task_categories:
+- text-generation
+language:
+- en
+tags:
+- code
+- python
+arxiv: 2508.02455
 dataset_info:
   features:
   - name: idx
@@ -141,4 +150,5 @@ If you use this dataset, please cite the original paper:
   author={Cipollone, Daniele and Bogomolov, Egor and van Deursen, Arie and Izadi, Maliheh},
   journal={arXiv preprint arXiv:2508.02455},
   year={2025}
-}
+}
+```