Update README.md

Added - Windows Python Versions, Description about IPython Notebooks

Author: KartikKannapur

README.md

@@ -7,7 +7,12 @@ Python is a modern, robust, high level programming language. It is very easy to
 
 ##Installation
 
-Mac OS X and Linux comes pre installed with python. Windows users can download python from https://www.python.org/downloads/ .
+Mac OS X and Linux comes pre-installed with Python. 
+
+Windows users can download Python from [https://www.python.org/downloads/](https://www.python.org/downloads/).
+
+Note : Make sure you download the corresponding version of Python depending on your Windows installation (34-bit or 64-bit)
+
 
 To install IPython run,
 
@@ -33,6 +38,8 @@ Canopy has a premium version which offers 300+ python packages. But the free ver
 
 ##Launching IPython Notebook
 
+The IPython Notebook is an interactive computational environment, in which you can combine code execution, rich text, mathematics, plots and rich media.
+
 From the terminal
 
     ipython notebook