Migrate model card from transformers-repo

Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/yjernite/bart_eli5/README.md

README.md

@@ -0,0 +1,10 @@
+---
+language: en
+license: apache-2.0
+datasets:
+- eli5
+---
+
+## BART ELI5
+
+Read the article at https://yjernite.github.io/lfqa.html and try the demo at https://huggingface.co/qa/