Improve model card: Add HF Paper link

This PR improves the model card by adding an explicit link to the Hugging Face Papers page for [EXAONE 4.0: Unified Large Language Models Integrating Non-reasoning and Reasoning Modes](https://huggingface.co/papers/2507.11407).

This ensures the model card is fully connected to its official paper presence on the Hugging Face Hub.

README.md

@@ -1,19 +1,19 @@
 ---
 base_model: LGAI-EXAONE/EXAONE-4.0-32B
-base_model_relation: quantized
-license: other
-license_name: exaone
-license_link: LICENSE
 language:
 - en
 - ko
 - es
+library_name: transformers
+license: other
+license_name: exaone
+license_link: LICENSE
+pipeline_tag: text-generation
 tags:
 - lg-ai
 - exaone
 - exaone-4.0
-pipeline_tag: text-generation
-library_name: transformers
+base_model_relation: quantized
 ---
 
 <p align="center">
@@ -22,6 +22,8 @@ library_name: transformers
 <br>✈️ Try on <a href="https://friendli.ai/suite/~/serverless-endpoints/LGAI-EXAONE/EXAONE-4.0-32B/overview">FriendliAI</a>
 <br>
 
+This model is described in the paper [EXAONE 4.0: Unified Large Language Models Integrating Non-reasoning and Reasoning Modes](https://huggingface.co/papers/2507.11407).
+
 # EXAONE-4.0-32B-AWQ
 
 ## Introduction
@@ -1142,4 +1144,4 @@ The model is licensed under [EXAONE AI Model License Agreement 1.2 - NC](./LICEN
 
 ## Contact
 
-LG AI Research Technical Support: [email protected]
+LG AI Research Technical Support: [email protected]