Changing the README

I have changed the readme to a markdown file. And inserted headings and subheadings wherever I found them to be necessary. I tried to put a table in, but I was unable to do so. I am still working on that. I have attached a screenshot :-

![image](https://cloud.githubusercontent.com/assets/3668034/2981449/35465e9a-dc06-11e3-8020-84261106e35b.png)