Create README.md

README.md

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+This model is a non-finetuned RAG-Token model and was created as follows:
+```python
+from transformers import RagTokenizer, RagSequenceForGeneration, AutoTokenizer
+
+model = RagSequenceForGeneration.from_pretrained_question_encoder_generator(
+    "facebook/dpr-question_encoder-single-nq-base",
+    "facebook/bart-base"
+)
+
+question_encoder_tokenizer = AutoTokenizer.from_pretrained("facebook/dpr-question_encoder-single-nq-base")
+generator_tokenizer = AutoTokenizer.from_pretrained("facebook/bart-base")
+
+tokenizer = RagTokenizer(question_encoder_tokenizer, generator_tokenizer)
+model.config.use_dummy_dataset = True
+model.config.index_name = "exact"
+
+model.save_pretrained("./")
+tokenizer.save_pretrained("./")
+```