added How to use

README.md

@@ -1,5 +1,21 @@
 Saying No is An Art: Contextualized Fallback Responses for Unanswerable Dialogue Queries
 
+#### How to use
+
+```python
+from transformers import T5ForConditionalGeneration, T5Tokenizer
+model_name = "ashish-shrivastava/dont-know-response"
+model = T5ForConditionalGeneration.from_pretrained(model_name)
+tokenizer = T5Tokenizer.from_pretrained(model_name)
+
+input = "Where can I find good Italian food ?"
+input_ids = tokenizer.encode(input, return_tensors="pt")
+outputs = model.generate(input_ids)
+decoded_output = tokenizer.decode(outputs[0], skip_special_tokens=True)
+print(decoded_output) # I'm not sure where you can get good quality Italian food.
+
+```
+
 ## Hyperparameters
 
 ```