Add Transformers library name, link to CC-BY-4.0 license

This PR improves the model card, by adding the Transformers library, linking it to the license,
and adding the text-generation pipeline tag.

README.md

@@ -1,7 +1,7 @@
 ---
-# For reference on dataset card metadata, see the spec: https://github.com/huggingface/hub-docs/blob/main/datasetcard.md?plain=1
-# Doc / guide: https://huggingface.co/docs/hub/datasets-cards
-{}
+license: cc-by-4.0
+library_name: transformers
+pipeline_tag: text-generation
 ---
 
 # CodeI/O: Condensing Reasoning Patterns via Code Input-Output Prediction