Add library name, pipeline tag, link to project

This PR adds the relevant `pipeline_tag` and `library_name` metadata tags to improve the model card,
ensuring this model can be easily found. The pipeline tag will ensure the model can be found at https://huggingface.co/models?pipeline_tag=text-generation.

README.md

@@ -1,4 +1,11 @@
 ---
 license: apache-2.0
+pipeline_tag: text-generation
+library_name: transformers
 ---
-Paper:arxiv.org/abs/2505.07787
+
+Paper:arxiv.org/abs/2505.07787
+
+Github repository: https://github.com/tongxuluo/LeaP
+
+Project page: https://learning-from-peers.github.io/