update model card

README.md

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+### Generate Arabic reviews sentences with model GPT-2 Medium.
+
+#### Load model
+
+```
+from transformers import AutoTokenizer, AutoModelWithLMHead
+  
+tokenizer = AutoTokenizer.from_pretrained("mofawzy/gpt-2-medium-ar")
+
+model = AutoModelWithLMHead.from_pretrained("mofawzy/gpt-2-medium-ar")
+```
+
+
+#### Notebook:
+https://colab.research.google.com/drive/1P0Raqrq0iBLNH87DyN9j0SwWg4C2HubV?usp=sharing