Add link to Common Pile paper and note the dataset is a component of the Common Pile v0.1.

This PR adds a link to the [Common Pile paper](https://huggingface.co/papers/2506.05209) for better context and to indicate that the dataset is a component of the Common Pile v0.1.

README.md

@@ -1,10 +1,11 @@
 ---
-task_categories:
-- text-generation
 language:
 - en
+task_categories:
+- text-generation
 pretty_name: ArXiv Abstracts
 ---
+
 # ArXiv Abstracts
 
 ## Description
@@ -14,6 +15,8 @@ Thus, this dataset contains the abstract for every paper submitted to ArXiv thro
 We source the abstracts from ArXiv’s API via the Open Archives Initiative Protocol for Metadata Harvesting endpoint and reproduce them as-is.
 Code for collecting, processing, and preparing this dataset is available in the [common-pile GitHub repo](https://github.com/r-three/common-pile).
 
+This dataset is a component of the [Common Pile v0.1](https://huggingface.co/papers/2506.05209).
+
 ## Dataset Statistics
 | Documents | UTF-8 GB |
 |-----------|-----------|
@@ -35,4 +38,4 @@ If you use this dataset, please cite:
   journal={arXiv preprint},
   year={2025}
 }
-```
+```