Create README.md (#6885)

model_cards/akhooli/mbart-large-cc25-en-ar/README.md

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+---
+tags:
+- translation
+
+language:
+- en
+- ar
+
+license: mit
+---
+### mbart-large-en-ar
+This is mbart-large-cc25, finetuned on a subset of the UN corpus for en_ar.  
+Usage: see [example notebook](https://colab.research.google.com/drive/1I6RFOWMaTpPBX7saJYjnSTddW0TD6H1t?usp=sharing) 
+Note: model has limited training set, not fully trained (do not use for production).