Add task category, license, and links to paper/GitHub

Hi! I'm Niels, part of the community science team at Hugging Face.

This PR improves the dataset card by:
- Adding the `text-classification` task category to the YAML metadata.
- Specifying the `cc-by-nc-4.0` license in the YAML metadata.
- Adding links to the official paper and the GitHub repository at the top of the dataset card for better accessibility.

README.md

@@ -1,4 +1,12 @@
 ---
+language:
+- en
+license: cc-by-nc-4.0
+task_categories:
+- text-classification
+size_categories:
+- 10K<n<100K
+pretty_name: Distributed Ledger Technology (DLT) / Blockchain Sentiment News
 dataset_info:
   features:
   - name: timestamp
@@ -63,8 +71,6 @@ configs:
   data_files:
   - split: train
     path: data/train-*
-language:
-- en
 tags:
 - DLT
 - Blockchain
@@ -74,12 +80,12 @@ tags:
 - Ethereum
 - XRP
 - Hedera
-pretty_name: Distributed Ledger Technology (DLT) / Blockchain Sentiment News
-size_categories:
-- 10K<n<100K
 ---
+
 # DLT-Sentiment-News
 
+[Paper](https://huggingface.co/papers/2602.22045) | [Code](https://github.com/dlt-science/DLT-Corpus)
+
 ## Dataset Description
 
 ### Dataset Summary