Migrate model card from transformers-repo

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Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/mrm8488/bert-spanish-cased-finetuned-pos/README.md

README.md

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+---
+language: es
+thumbnail: https://i.imgur.com/jgBdimh.png
+---
+
+# Spanish BERT (BETO) + POS
+
+This model is a fine-tuned on Spanish [CONLL CORPORA](https://www.kaggle.com/nltkdata/conll-corpora) version of the Spanish BERT cased [(BETO)](https://github.com/dccuchile/beto) for **POS** (Part of Speech tagging) downstream task.
+
+## Details of the downstream task (POS) - Dataset
+
+- [Dataset:  CONLL Corpora ES](https://www.kaggle.com/nltkdata/conll-corpora) with data augmentation techniques
+
+I preprocessed the dataset and split it as train / dev (80/20)
+
+| Dataset                | # Examples |
+| ---------------------- | ----- |
+| Train                  | 340 K |
+| Dev                    | 50 K |
+
+
+- [Fine-tune on NER script provided by Huggingface](https://github.com/huggingface/transformers/blob/master/examples/token-classification/run_ner_old.py)
+
+- **60** Labels covered:
+
+```
+AO, AQ, CC, CS, DA, DD, DE, DI, DN, DP, DT, Faa, Fat, Fc, Fd, Fe, Fg, Fh, Fia, Fit, Fp, Fpa, Fpt, Fs, Ft, Fx, Fz, I, NC, NP, P0, PD, PI, PN, PP, PR, PT, PX, RG, RN, SP, VAI, VAM, VAN, VAP, VAS, VMG, VMI, VMM, VMN, VMP, VMS, VSG, VSI, VSM, VSN, VSP, VSS, Y and Z
+```
+
+
+## Metrics on evaluation set:
+
+|                                                      Metric                                                       |  # score  |
+| :------------------------------------------------------------------------------------: | :-------: |
+| F1                                       | **90.06**  
+| Precision                                | **89.46** | 
+| Recall                                   | **90.67** |                                    
+
+## Model in action
+
+Fast usage with **pipelines**:
+
+```python
+from transformers import pipeline
+
+nlp_pos = pipeline(
+    "ner",
+    model="mrm8488/bert-spanish-cased-finetuned-pos",
+    tokenizer=(
+        'mrm8488/bert-spanish-cased-finetuned-pos',  
+        {"use_fast": False}
+))
+
+
+text = 'Mis amigos están pensando en viajar a Londres este verano'
+
+nlp_pos(text)
+
+#Output:
+'''
+[{'entity': 'NC', 'score': 0.7792173624038696, 'word': '[CLS]'},
+ {'entity': 'DP', 'score': 0.9996283650398254, 'word': 'Mis'},
+ {'entity': 'NC', 'score': 0.9999253749847412, 'word': 'amigos'},
+ {'entity': 'VMI', 'score': 0.9998560547828674, 'word': 'están'},
+ {'entity': 'VMG', 'score': 0.9992249011993408, 'word': 'pensando'},
+ {'entity': 'SP', 'score': 0.9999602437019348, 'word': 'en'},
+ {'entity': 'VMN', 'score': 0.9998666048049927, 'word': 'viajar'},
+ {'entity': 'SP', 'score': 0.9999545216560364, 'word': 'a'},
+ {'entity': 'VMN', 'score': 0.8722310662269592, 'word': 'Londres'},
+ {'entity': 'DD', 'score': 0.9995203614234924, 'word': 'este'},
+ {'entity': 'NC', 'score': 0.9999248385429382, 'word': 'verano'},
+ {'entity': 'NC', 'score': 0.8802427649497986, 'word': '[SEP]'}]
+ '''
+```
+![model in action](https://media.giphy.com/media/jVC9m1cNrdIWuAAtjy/giphy.gif)
+
+16 POS tags version also available [here](https://huggingface.co/mrm8488/bert-spanish-cased-finetuned-pos-16-tags)
+
+
+> Created by [Manuel Romero/@mrm8488](https://twitter.com/mrm8488)
+
+> Made with <span style="color: #e25555;">&hearts;</span> in Spain