Correct pipeline tag and add citation metadata

This PR corrects the `pipeline_tag` to `text-to-image` to accurately reflect the model's functionality and adds a standard `citation` field to the YAML metadata, removing the non-standard `cite` field from the markdown.

README.md

@@ -1,11 +1,18 @@
 ---
-license: apache-2.0
 language:
 - en
 library_name: diffusers
+license: apache-2.0
 pipeline_tag: text-to-image
-cite: arxiv.org/abs/2403.02084
+citation: >
+  @article{cheng2024resadapter,
+    title={ResAdapter: Domain Consistent Resolution Adapter for Diffusion Models},
+    author={Cheng, Jiaxiang and Xie, Pan and Xia, Xin and Li, Jiashi and Wu, Jie and Ren, Yuxi and Li, Huixia and Xiao, Xuefeng and Zheng, Min and Fu, Lean},
+    booktitle={arXiv preprint arxiv:2403.02084},
+    year={2024}
+  }
 ---
+
 # ResAdapter Model Card
 
 <div align="center">