Add pipeline tag and library name

This PR adds the relevant `pipeline_tag` and `library_name` to improve discoverability on the Hub. It also adds a link to the arXiv paper.

README.md

@@ -1,9 +1,13 @@
 ---
 license: apache-2.0
+pipeline_tag: image-classification
+library_name: transformers
 ---
+
 💫 Official implementation of Charm: The Missing Piece in ViT fine-tuning for Image Aesthetic Assessment 
 
 > [**Accepted at CVPR 2025**](https://cvpr.thecvf.com/virtual/2025/poster/34423)<br>
+> [**arXiv**](https://arxiv.org/abs/2504.02522)<br>
 
 <div align="left">
 <a href="https://github.com/FBehrad/Charm">