Migrate model card from transformers-repo

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Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/ashwani-tanwar/Gujarati-XLM-R-Base/README.md

README.md

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+---
+language: gu
+---
+
+# Gujarati-XLM-R-Base
+
+
+This model is finetuned over [XLM-RoBERTa](https://huggingface.co/xlm-roberta-base) (XLM-R) using its base variant with the Gujarati language using the [OSCAR](https://oscar-corpus.com/) monolingual dataset. We used the same masked language modelling (MLM) objective which was used for pretraining the XLM-R. As it is built over the pretrained XLM-R, we leveraged *Transfer Learning* by exploiting the knowledge from its parent model.
+
+## Dataset
+OSCAR corpus contains several diverse datasets for different languages. We followed the work of [CamemBERT](https://www.aclweb.org/anthology/2020.acl-main.645/) who reported better performance with this diverse dataset as compared to the other large homogenous datasets. 
+
+## Preprocessing and Training Procedure
+Please visit [this link](https://github.com/ashwanitanwar/nmt-transfer-learning-xlm-r#6-finetuning-xlm-r) for the detailed procedure.
+
+## Usage
+- This model can be used for further finetuning for different NLP tasks using the Gujarati language.
+- It can be used to generate contextualised word representations for the Gujarati words.
+- It can be used for domain adaptation.
+- It can be used to predict the missing words from the Gujarati sentences.
+
+## Demo
+ ### Using the model to predict missing words
+   ```
+   from transformers import pipeline
+   unmasker = pipeline('fill-mask', model='ashwani-tanwar/Gujarati-XLM-R-Base')
+   pred_word = unmasker("અમદાવાદ એ ગુજરાતનું એક <mask> છે.")
+   print(pred_word) 
+   ```
+   ```
+  [{'sequence': '<s> અમદાવાદ એ ગુજરાતનું એક શહેર છે.</s>', 'score': 0.9463568329811096, 'token': 85227, 'token_str': '▁શહેર'}, 
+  {'sequence': '<s> અમદાવાદ એ ગુજરાતનું એક ગામ છે.</s>', 'score': 0.013311690650880337, 'token': 66346, 'token_str': '▁ગામ'}, 
+  {'sequence': '<s> અમદાવાદ એ ગુજરાતનું એકનગર છે.</s>', 'score': 0.012945962138473988, 'token': 69702, 'token_str': 'નગર'}, 
+  {'sequence': '<s> અમદાવાદ એ ગુજરાતનું એક સ્થળ છે.</s>', 'score': 0.0045941537246108055, 'token': 135436, 'token_str': '▁સ્થળ'}, 
+  {'sequence': '<s> અમદાવાદ એ ગુજરાતનું એક મહત્વ છે.</s>', 'score': 0.00402021361514926, 'token': 126763, 'token_str': '▁મહત્વ'}]
+   ```
+ ### Using the model to generate contextualised word representations
+  ```
+  from transformers import AutoTokenizer, AutoModel
+  tokenizer = AutoTokenizer.from_pretrained("ashwani-tanwar/Gujarati-XLM-R-Base")
+  model = AutoModel.from_pretrained("ashwani-tanwar/Gujarati-XLM-R-Base")
+  sentence = "અમદાવાદ એ ગુજરાતનું એક શહેર છે."
+  encoded_sentence = tokenizer(sentence, return_tensors='pt')
+  context_word_rep = model(**encoded_sentence)
+  ```