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/tuner007/pegasus_paraphrase/README.md

README.md

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+# Pegasus for Paraphrasing
+Pegasus model fine-tuned for paraphrasing
+
+## Model in Action 🚀
+```
+import torch
+from transformers import PegasusForConditionalGeneration, PegasusTokenizer
+model_name = 'tuner007/pegasus_paraphrase'
+torch_device = 'cuda' if torch.cuda.is_available() else 'cpu'
+tokenizer = PegasusTokenizer.from_pretrained(model_name)
+model = PegasusForConditionalGeneration.from_pretrained(model_name).to(torch_device)
+
+def get_response(input_text,num_return_sequences):
+  batch = tokenizer.prepare_seq2seq_batch([input_text],truncation=True,padding='longest',max_length=60, return_tensors="pt").to(torch_device)
+  translated = model.generate(**batch,max_length=60,num_beams=10, num_return_sequences=num_return_sequences, temperature=1.5)
+  tgt_text = tokenizer.batch_decode(translated, skip_special_tokens=True)
+  return tgt_text
+```
+#### Example 1: 
+```
+context = "The ultimate test of your knowledge is your capacity to convey it to another."
+get_response(context,10)
+# output:
+['The test of your knowledge is your ability to convey it.',
+ 'The ability to convey your knowledge is the ultimate test of your knowledge.',
+ 'The ability to convey your knowledge is the most important test of your knowledge.',
+ 'Your capacity to convey your knowledge is the ultimate test of it.',
+ 'The test of your knowledge is your ability to communicate it.',
+ 'Your capacity to convey your knowledge is the ultimate test of your knowledge.',
+ 'Your capacity to convey your knowledge to another is the ultimate test of your knowledge.',
+ 'Your capacity to convey your knowledge is the most important test of your knowledge.',
+ 'The test of your knowledge is how well you can convey it.',
+ 'Your capacity to convey your knowledge is the ultimate test.']
+```
+#### Example 2: Question paraphrasing (was not trained on quora dataset)
+```
+context = "Which course should I take to get started in data science?"
+get_response(context,10)
+# output: 
+['Which data science course should I take?',
+ 'Which data science course should I take first?',
+ 'Should I take a data science course?',
+ 'Which data science class should I take?',
+ 'Which data science course should I attend?',
+ 'I want to get started in data science.',
+ 'Which data science course should I enroll in?',
+ 'Which data science course is right for me?',
+ 'Which data science course is best for me?',
+ 'Which course should I take to get started?']
+```
+
+> Created by Arpit Rajauria
+[![Twitter icon](https://cdn0.iconfinder.com/data/icons/shift-logotypes/32/Twitter-32.png)](https://twitter.com/arpit_rajauria)