Add graph-ml task category and paper link

Hi, I'm Niels from the Hugging Face community science team. I've updated the dataset card to include the `graph-ml` task category in the metadata to improve discoverability. I've also linked the associated research paper ("Predicting Channel Closures in the Lightning Network with Machine Learning") to its Hugging Face paper page.

README.md

@@ -1,27 +1,29 @@
 ---
-license: cc-by-4.0
 language:
-  - en
-pretty_name: Lightning Network Gossip Channel Closure Dataset
+- en
+license: cc-by-4.0
 size_categories:
-  - 100K<n<1M
+- 100K<n<1M
+pretty_name: Lightning Network Gossip Channel Closure Dataset
+task_categories:
+- graph-ml
 tags:
-  - lightning-network
-  - bitcoin
-  - temporal-graph
-  - link-classification
+- lightning-network
+- bitcoin
+- temporal-graph
+- link-classification
 configs:
-  - config_name: default
-    data_files:
-      - split: full
-        path: tgbl-ln_edgelist.csv
+- config_name: default
+  data_files:
+  - split: full
+    path: tgbl-ln_edgelist.csv
 ---
 
 # Lightning Network Gossip — Channel Closure Dataset
 
 Daily snapshots of the Lightning Network (LN) collected from gossip messages
-between **2022-06-09** and **2024-10-14**. Used in the paper *Predicting
-Channel Closures in the Lightning Network with Machine Learning* (Antonelli
+between **2022-06-09** and **2024-10-14**. Used in the paper [Predicting
+Channel Closures in the Lightning Network with Machine Learning](https://huggingface.co/papers/2605.12759) (Antonelli
 et al., 2026, under review) and consumed by the
 [ln-channel-closure-prediction](https://github.com/AmbossTech/ln-channel-closure-prediction)
 codebase.
@@ -63,4 +65,4 @@ public by design.
 
 ## Citation
 
-A BibTeX entry will be added once the paper is published.
+A BibTeX entry will be added once the paper is published.