Update README.md

Author: parulnith

README.md

@@ -12,20 +12,28 @@ On similar lines let's create a very basic chatbot utlising the Python's NLTK li
 * Motivation
 * Blogpost
 * Pre-requisites
-* Installation
 * How to run
 
 
-
 ## Motivation
-
 The idea of this project was not to create some SOTA chatbot with exceptional cognitive skills but just to utilise and test my Python skills.This was one of my very first projects, created  when I just stepped into the world of NLP and I thought of creating a simple chatbot just to make use of my newly acquired knowledge.
 
 ## BlogPost
-For detailed overview, here is 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)
-
+For detailed overview, here is 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)
 
 
 ## Pre-requisites
+**NLTK(Natural Language Toolkit)**
+
+[Natural Language Processing with Python](http://www.nltk.org/book/) provides a practical introduction to programming for language processing.
+
+For platform-specific instructions, read [here](https://www.nltk.org/install.html)
+
+### Installation of NLTK
+```
+pip install nltk
+```
+
+