Add license, pipeline tag, and library name to model card

This PR enhances the model card by adding essential metadata:
- `license: apache-2.0`: Explicitly states the licensing terms, providing clarity for users.
- `pipeline_tag: text-generation`: Ensures the model is discoverable through relevant filters on the Hugging Face Hub (https://huggingface.co/models?pipeline_tag=text-generation).
- `library_name: transformers`: Indicates compatibility with the Hugging Face Transformers library, enabling easier programmatic access and usage through the "Use in Transformers" widget.

These additions improve the discoverability and usability of the model for the community.

README.md

@@ -15,6 +15,9 @@ datasets:
 - declare-lab/HarmfulQA
 language:
 - en
+license: apache-2.0
+pipeline_tag: text-generation
+library_name: transformers
 ---
 
 <p align="center">
@@ -29,7 +32,7 @@ language:
     <img src="https://img.shields.io/badge/GitHub-Repository-blue?logo=github" alt="GitHub"/>
   </a>
   <a href="https://huggingface.co/IAAR-Shanghai/MARA_AGENTS">
-    <img src="https://img.shields.io/badge/🤗%20Hugging%20Face-MARA_AGENTS-yellow" alt="Hugging Face"/>
+    <img src="https://img.shields.io/badge/🤗%20Hugging%20 Face-MARA_AGENTS-yellow" alt="Hugging Face"/>
   </a>
     <a href="https://arxiv.org/abs/2505.19743">
         <img src="https://img.shields.io/badge/arXiv-Paper-8B0000?style=flat-square&logo=arxiv&logoColor=white">
@@ -67,7 +70,7 @@ The source code and implementation details are open-sourced at [MARA](https://gi
 
 
 
-###  📊 Experiment Results
+### 📊 Experiment Results
 <table class="center">
     <tr>
         <td width=100% style="border: none">
@@ -96,7 +99,7 @@ The source code and implementation details are open-sourced at [MARA](https://gi
 
 More details and analyses about experimental results can be found in our [paper](https://arxiv.org/abs/2505.19743).
 
-###  ✍️ Citation
+### ✍️ Citation
 If the code or the paper has been useful in your research, please add a citation to our work:
 ```
 @article{zhang2025tokenlevelacceptrejectmicro,
@@ -105,4 +108,4 @@ If the code or the paper has been useful in your research, please add a citation
       journal={arXiv preprint arXiv:2505.19743},
       year={2025}
 }
-```
+```