Update README.md

Author: parulnith

README.md

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-# Building a Simple Chatbot in Python (using NLTK)
+# Building a Simple Chatbot from Scratch in Python (using NLTK)
 
-Gartner estimates that by 2020, chatbots will be handling 85 percent of customer-service interactions; they are already handling about 30 percent of transactions now.
+![Alt text](https://cdn-images-1.medium.com/max/800/1*pPcVfZ7i-gLMabUol3zezA.gif)
+
+History of chatbots dates back to 1966 when a computer program called ELIZA was invented by Weizenbaum. It imitated the language of a psychotherapist from only 200 lines of code. You can still converse with it here: [Eliza](http://psych.fullerton.edu/mbirnbaum/psych101/Eliza.htm?utm_source=ubisend.com&utm_medium=blog-link&utm_campaign=ubisend). 
+
+On similar lines let's create a very basic chatbot utlising the Python's NLTK library.It's a very simple bot with hardly any cognitive skills,but still a good way to get into NLP and get to know about chatbots.
+
+For detailed analysis, please see the accompanying blog titled:**[Building a Simple Chatbot in Python (using NLTK](https://medium.com/analytics-vidhya/building-a-simple-chatbot-in-python-using-nltk-7c8c8215ac6e)
 
-This is the Repository linked with my published article on Medium with the same title. Please find the link to the article [here](https://medium.com/analytics-vidhya/building-a-simple-chatbot-in-python-using-nltk-7c8c8215ac6e)