Update README.md

Author: Stable-X

README.md

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 This repository represents the official implementation of the paper titled "Repurposing Diffusion-Based Image Generators for Monocular Depth Estimation".
 
 [![Website](https://raw.githubusercontent.com/prs-eth/Marigold/main/doc/badges/badge-website.svg)](https://stable-x.github.io/StableNormal)
-[![Paper](https://img.shields.io/badge/arXiv-PDF-b31b1b)]()
+[![Paper](https://img.shields.io/badge/arXiv-PDF-b31b1b)](https://arxiv.org/abs/2406.16864)
 [![Hugging Face Space](https://img.shields.io/badge/🤗%20Hugging%20Face%20-Space-yellow)](https://huggingface.co/spaces/Stable-X/StableNormal)
 [![Hugging Face Model](https://img.shields.io/badge/🤗%20Hugging%20Face%20-Model-green)](https://huggingface.co/Stable-X/stable-normal-v0-1)
 [![License](https://img.shields.io/badge/License-Apache--2.0-929292)](https://www.apache.org/licenses/LICENSE-2.0)