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/akhooli/xlm-r-large-arabic-sent/README.md

README.md

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+---
+
+language:
+- ar
+- en
+
+license: mit
+---
+### xlm-r-large-arabic-sent 
+Multilingual sentiment classification (Label_0: mixed, Label_1: negative, Label_2: positive) of Arabic reviews by fine-tuning XLM-Roberta-Large. 
+Zero shot classification of other languages (also works in mixed languages - ex. Arabic & English). Mixed category is not accurate and may confuse other 
+classes (was based on a rate of 3 out of 5 in reviews).  
+Usage: see last section in this [Colab notebook](https://lnkd.in/d3bCFyZ)