Add model card metadata and links to the project page and code repository

This PR adds the `pipeline_tag` and `library_name` to the model card, linking it to the paper [SceneCraft: Layout-Guided 3D Scene Generation](https://huggingface.co/papers/2410.09049). It also adds a link to the project page and the Github repository.

README.md

@@ -1,3 +1,11 @@
----
-license: apache-2.0
----
+---
+license: apache-2.0
+library_name: diffusers
+pipeline_tag: text-to-3d
+---
+
+This repository contains the model described in the paper [SceneCraft: Layout-Guided 3D Scene Generation](https://huggingface.co/papers/2410.09049).
+
+Project page: https://orangesodahub.github.io/SceneCraft
+
+Code: https://github.com/OrangeSodahub/SceneCraft