Add `library_name: transformers` to metadata

This PR updates the model card by adding `library_name: transformers` to the metadata.

Evidence for `transformers` compatibility:
- The `config.json` file contains `"transformers_version": "4.46.2"` and `architectures: ["LLaDAForMultiModalGeneration"]`, along with `auto_map` entries that point to `configuration_llada.LLaDAConfig` and `modeling_llada.LLaDAModelLM`.
- The presence of standard Hugging Face files like `tokenizer.json`, `special_tokens_map.json`, `tokenizer_config.json`, and `generation_config.json` further confirms compatibility.

This addition will enable the automated "How to use" widget on the model page, showcasing a code snippet for using the model with the 🤗 Transformers library, thereby improving its discoverability and ease of use.

README.md

@@ -4,6 +4,7 @@ pipeline_tag: any-to-any
 tags:
 - Diffusion Large Language Model
 - Multi-Modal Generation and Understanding
+library_name: transformers
 ---
 
 <p align="center">
@@ -127,5 +128,4 @@ This work was also supported and implemented by [MindSpeed MM](https://gitee.com
       year={2025},
       url={https://github.com/Alpha-VLLM/Lumina-DiMOO},
 }
-```
- 
+```