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/rdenadai/BR_BERTo/README.md

README.md

@@ -0,0 +1,30 @@
+---
+language: pt
+tags:
+- portuguese
+- brazil
+- pt_BR
+widget:
+- text: gostei muito dessa <mask>
+---
+
+# BR_BERTo
+
+Portuguese (Brazil) model for text inference.
+
+## Params
+
+Trained on a corpus of 6_993_330 sentences.
+
+- Vocab size: 150_000
+- RobertaForMaskedLM  size : 512
+- Num train epochs: 3
+- Time to train: ~10days (on GCP with a Nvidia T4)
+
+I follow the great tutorial from HuggingFace team:
+
+[How to train a new language model from scratch using Transformers and Tokenizers](https://huggingface.co/blog/how-to-train)
+
+More infor here:
+
+[BR_BERTo](https://github.com/rdenadai/BR-BERTo)