Add model card

This PR adds a model card with relevant metadata (pipeline tag, library name) and links to the paper, project page, and code. It ensures the model is discoverable via the image-text-to-text pipeline tag.

README.md

@@ -1,3 +1,15 @@
 ---
 license: mit
+library_name: transformers
+pipeline_tag: image-text-to-text
 ---
+
+This repository contains the PrismaCoder-9B model described in [PrismaCoder: Pushing the Boundaries of Open Multimodal Code Intelligence through Decomposed Rubric Synthesis](https://huggingface.co/papers/2610.20538).
+
+Project page: https://qiushisun.github.io/PrismaCoder-Home/
+
+Code: https://github.com/QiushiSun/PrismaCoder
+
+PrismaCoder is a family of open multimodal code models for generating and editing charts, webpages, diagrams, documents, and animations from text or visual inputs. This checkpoint is trained on the PrismaCoder-2M dataset using supervised fine-tuning and reinforcement learning.
+
+For more details, please refer to the [paper](https://arxiv.org/abs/2610.20538) and the [project page](https://qiushisun.github.io/PrismaCoder-Home/).