Add `library_name: transformers` to metadata

This PR updates the model card to include the `library_name: transformers` in the metadata.

This addition is based on the model's `config.json` and `tokenizer_config.json` files, which indicate compatibility with the `transformers` library (e.g., `model_type: llama`, `tokenizer_class: LlamaTokenizer`, `transformers_version`).

Adding `library_name` enables the automated "how to use" widget on the model page, providing users with a readily available code snippet for interacting with the model using the 🤗 Transformers library.

README.md

@@ -1,13 +1,15 @@
 ---
-license: apache-2.0
 datasets:
 - databricks/databricks-dolly-15k
 language:
 - en
+license: apache-2.0
 metrics:
 - rouge
 pipeline_tag: text-generation
+library_name: transformers
 ---
+
 # init-Llama-7B
 
 [paper](https://arxiv.org/abs/2306.08543) | [code](https://github.com/microsoft/LMOps/tree/main/minillm)