feat: add initial readme

Signed-off-by: Suvaditya Mukherjee <suvadityamuk@gmail.com>

README.md

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+# 3D-Arena
 
-Edit this `README.md` markdown file to author your organization card.
+![3D-Arena Logo](image.png)
+
+Hello, welcome to the 3D-Arena org!
+
+This organization hosts the [3D-Arena project](https://huggingface.co/spaces/3d-arena/3d-arena), a leaderboard platform for evaluating 3D Generation models. 
+
+# Compatibility
+
+We currently host 3D Object models in the form of Gaussian Splats (such as .ply files, .splat files, or .obj files) and Mesh-based models (in the form of .glb files). 
+
+# Contributing Guide
+
+If you'd like to contribute to the leaderboard, please open a [new Community Issue](https://huggingface.co/spaces/3d-arena/3d-arena/discussions) to discuss the changes you'd like to make. 
+
+If you'd like to contribute a new model, please provide a link to the publication/paper/blog post describing the model and/or methodology along with the licensing requirements for the generated objects.