Add initial model card

This PR adds a model card, sets the `library_name` to transformers, and sets the `pipeline_tag` to text-generation.

README.md

@@ -1,7 +1,6 @@
 ---
-# 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
-{}
+library_name: transformers
+pipeline_tag: text-generation
 ---
 
 # CodeI/O: Condensing Reasoning Patterns via Code Input-Output Prediction