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/spanbert-finetuned-squadv1/README.md

README.md

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+---
+language: en
+thumbnail:
+---
+
+# SpanBERT (spanbert-base-cased) fine-tuned on SQuAD v1.1
+
+
+[SpanBERT](https://github.com/facebookresearch/SpanBERT) created by [Facebook Research](https://github.com/facebookresearch) and fine-tuned on [SQuAD 1.1](https://rajpurkar.github.io/SQuAD-explorer/) for **Q&A** downstream task.
+
+## Details of SpanBERT
+
+ A pre-training method that is designed to better represent and predict spans of text.
+
+[SpanBERT: Improving Pre-training by Representing and Predicting Spans](https://arxiv.org/abs/1907.10529)
+
+## Details of the downstream task (Q&A) - Dataset
+
+[SQuAD 1.1](https://rajpurkar.github.io/SQuAD-explorer/) contains 100,000+ question-answer pairs on 500+ articles.
+
+| Dataset  | Split | # samples |
+| -------- | ----- | --------- |
+| SQuAD1.1 | train | 87.7k     |
+| SQuAD1.1 | eval  | 10.6k     |
+
+## Model training
+
+The model was trained on a Tesla P100 GPU and 25GB of RAM.
+The script for fine tuning can be found [here](https://github.com/huggingface/transformers/blob/master/examples/question-answering/run_squad.py)
+
+## Results:
+
+| Metric | # Value   |
+| ------ | --------- |
+| **EM** | **85.49** |
+| **F1** | **91.98** |
+
+### Raw metrics:
+
+```json
+{
+  "exact": 85.49668874172185,
+  "f1": 91.9845699540379,
+  "total": 10570,
+  "HasAns_exact": 85.49668874172185,
+  "HasAns_f1": 91.9845699540379,
+  "HasAns_total": 10570,
+  "best_exact": 85.49668874172185,
+  "best_exact_thresh": 0.0,
+  "best_f1": 91.9845699540379,
+  "best_f1_thresh": 0.0
+}
+```
+
+## Comparison:
+
+| Model                                                                                     | EM        | F1 score  |
+| ----------------------------------------------------------------------------------------- | --------- | --------- |
+| [SpanBert official repo](https://github.com/facebookresearch/SpanBERT#pre-trained-models) | -         | 92.4\* |
+| [spanbert-finetuned-squadv1](https://huggingface.co/mrm8488/spanbert-finetuned-squadv1)   | **85.49** | **91.98** |
+
+## Model in action
+
+Fast usage with **pipelines**:
+
+```python
+from transformers import pipeline
+
+qa_pipeline = pipeline(
+    "question-answering",
+    model="mrm8488/spanbert-finetuned-squadv1",
+    tokenizer="mrm8488/spanbert-finetuned-squadv1"
+)
+
+qa_pipeline({
+    'context': "Manuel Romero has been working hardly in the repository hugginface/transformers lately",
+    'question': "Who has been working hard for hugginface/transformers lately?"
+
+})
+```
+
+> Created by [Manuel Romero/@mrm8488](https://twitter.com/mrm8488) | [LinkedIn](https://www.linkedin.com/in/manuel-romero-cs/) 
+
+> Made with <span style="color: #e25555;">&hearts;</span> in Spain