Migrate model card from transformers-repo

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Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/akhooli/gpt2-small-arabic/README.md

README.md

@@ -0,0 +1,44 @@
+---
+language: "ar"
+datasets:
+- Arabic Wikipedia
+metrics:
+- none
+---
+
+# GPT2-Small-Arabic
+
+## Model description
+
+GPT2 model from Arabic Wikipedia dataset based on gpt2-small (using Fastai2).
+
+## Intended uses & limitations
+
+#### How to use
+
+An example is provided in this [colab notebook](https://colab.research.google.com/drive/1mRl7c-5v-Klx27EEAEOAbrfkustL4g7a?usp=sharing). 
+Both text and poetry (fine-tuned model) generation are included.
+
+#### Limitations and bias
+
+GPT2-small-arabic (trained on Arabic Wikipedia) has several limitations in terms of coverage (Arabic Wikipeedia quality, no diacritics) and training performance. 
+Use as demonstration or proof of concepts but not as production code.
+
+## Training data
+
+This pretrained model used the Arabic Wikipedia dump (around 900 MB). 
+
+## Training procedure
+
+Training was done using [Fastai2](https://github.com/fastai/fastai2/) library on Kaggle, using free GPU.
+
+## Eval results 
+Final perplexity reached was 72.19,  loss: 4.28, accuracy: 0.307
+
+### BibTeX entry and citation info
+
+```bibtex
+@inproceedings{Abed Khooli,
+  year={2020}
+}
+```