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/pranavpsv/gpt2-genre-story-generator/README.md

README.md

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+
+# GPT2 Genre Based Story Generator
+
+## Model description
+
+GPT2 fine-tuned on genre-based story generation.
+
+## Intended uses
+
+Used to generate stories based on user inputted genre and starting prompts.
+
+## How to use
+
+#### Supported Genres
+superhero, action, drama, horror, thriller, sci_fi
+#### Input text format
+\<BOS> \<genre> Some optional text...
+
+**Example**: \<BOS> \<sci_fi> After discovering time travel,
+
+```python
+# Example of usage
+from transformers import pipeline
+
+story_gen = pipeline("text-generation", "pranavpsv/gpt2-genre-story-generator")
+print(story_gen("<BOS> <superhero> Batman"))
+
+```
+
+## Training data
+
+Initialized with pre-trained weights of "gpt2" checkpoint. Fine-tuned the model on stories of various genres.