Add pipeline and library tags

This PR adds the `pipeline_tag` and `library_name` to the model card metadata. The `pipeline_tag` is set to `unconditional-image-generation` because the model generates images without explicit text prompts. The `library_name` is set to `pytorch`.

README.md

@@ -1,12 +1,15 @@
 ---
-license: mit
 datasets:
 - ILSVRC/imagenet-1k
 - ljnlonoljpiljm/places365-256px
 language:
 - en
 - zh
+license: mit
+pipeline_tag: unconditional-image-generation
+library_name: pytorch
 ---
+
 [![arXiv](https://img.shields.io/badge/arXiv%20paper-2503.18948-b31b1b.svg)](https://arxiv.org/abs/2503.18948) 
 This is an official model card of the paper [Equivariant Image Modeling](https://arxiv.org/abs/2503.18948).