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/mrm8488/GuaPeTe-2-tiny/README.md

README.md

@@ -0,0 +1,7 @@
+---
+language: es
+widget:
+- text: "Murcia es la huerta de Europa porque"
+---
+
+#GuaPeTe-2-tiny: A proof of concept tiny GPT-2 like model trained on Spanish Wikipedia corpus