Add library_name, pipeline_tag

Adds library_name and pipeline_tag for better discoverability.

README.md

@@ -1,6 +1,9 @@
 ---
 license: apache-2.0
+library_name: transformers
+pipeline_tag: text-generation
 ---
+
 # lmarena-ai/p2l-360m-rk-01132025
 
 Large language model (LLM) evaluations typically rely on aggregated metrics like accuracy or human preference, averaging across users and prompts. This averaging obscures user- and prompt-specific variations in model performance.