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/ktrapeznikov/gpt2-medium-topic-news/README.md

README.md

@@ -0,0 +1,41 @@
+---
+language: 
+- en
+thumbnail:
+widget:
+ - text: "topic: climate article:"
+---
+
+# GPT2-medium-topic-news
+
+## Model description
+
+GPT2-medium fine tuned on a large news corpus conditioned on a topic
+
+## Intended uses & limitations
+
+#### How to use
+
+To generate a news article text conditioned on a topic, prompt model with: 
+`topic: climate article:`
+
+The following tags were used during training:
+`arts law international science business politics disaster world conflict football sport sports artanddesign environment music film lifeandstyle business health commentisfree books technology media education politics travel stage uk society us money culture religion science news tv fashion uk australia cities global childrens sustainable global voluntary housing law local healthcare theguardian`
+
+Zero shot generation works pretty well as long as `topic` is a single word and not too specific.
+
+```python
+device = "cuda:0"
+tokenizer = AutoTokenizer.from_pretrained("ktrapeznikov/gpt2-medium-topic-news")
+model = AutoModelWithLMHead.from_pretrained("ktrapeznikov/gpt2-medium-topic-news")
+model.to(device)
+topic = "climate"
+prompt = tokenizer(f"topic: {topic} article:", return_tensors="pt")
+out = model.generate(prompt["input_ids"].to(device), do_sample=True,max_length=500, early_stopping=True, top_p=.9)
+print(tokenizer.decode(list(out.cpu()[0])))
+```
+
+## Training data
+
+
+## Training procedure