Migrate model card from transformers-repo

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Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/allenai/biomed_roberta_base/README.md

README.md

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+---
+thumbnail: https://huggingface.co/front/thumbnails/allenai.png
+---
+
+# BioMed-RoBERTa-base
+
+BioMed-RoBERTa-base is a language model based on the RoBERTa-base (Liu et. al, 2019) architecture. We adapt RoBERTa-base to 2.68 million scientific papers from the [Semantic Scholar](https://www.semanticscholar.org) corpus via continued pretraining. This amounts to 7.55B tokens and 47GB of data. We use the full text of the papers in training, not just abstracts.
+
+Specific details of the adaptive pretraining procedure can be found in Gururangan et. al, 2020. 
+
+
+## Evaluation
+
+BioMed-RoBERTa achieves competitive performance to state of the art models on a number of NLP tasks in the biomedical domain (numbers are mean (standard deviation) over 3+ random seeds)
+
+
+| Task         | Task Type           | RoBERTa-base | BioMed-RoBERTa-base |
+|--------------|---------------------|--------------|---------------------|
+| RCT-180K     | Text Classification | 86.4 (0.3)   | 86.9 (0.2)          |
+| ChemProt     | Relation Extraction | 81.1 (1.1)   | 83.0 (0.7)          |
+| JNLPBA       | NER                 | 74.3 (0.2)   | 75.2 (0.1)          |
+| BC5CDR       | NER                 | 85.6 (0.1)   | 87.8 (0.1)          |
+| NCBI-Disease | NER                 | 86.6 (0.3)   | 87.1 (0.8)          |
+
+More evaluations TBD.
+
+## Citation
+
+If using this model, please cite the following paper:
+
+```bibtex
+@inproceedings{domains,
+ author = {Suchin Gururangan and Ana Marasović and Swabha Swayamdipta and Kyle Lo and Iz Beltagy and Doug Downey and Noah A. Smith},
+ title = {Don't Stop Pretraining: Adapt Language Models to Domains and Tasks},
+ year = {2020},
+ booktitle = {Proceedings of ACL},
+}
+```