Add pipeline tag

This PR ensures the model can be found at https://huggingface.co/models?pipeline_tag=text-to-3d&sort=trending

README.md

@@ -1,3 +1,9 @@
+---
+pipeline_tag: text-to-3d
+tags:
+- image-to-3d
+---
+
 <!-- ## **Hunyuan3D-1.0** -->
 
 <p align="center">