Instructions to activate environment for windows

For windows user is not trivial to figure out the correct command to activate and deactivate an environment, you need search on the web to find the correct answer.

README.rst

@@ -71,11 +71,15 @@ default, you would run
 This creates an environment called ``numpy16`` with the latest version of
 the IPython notebook, NumPy 1.6, and their dependencies.
 
-We can now activate this environment. On Linux and Mac OS X, use
+We can now activate this environment, use
 
 .. code-block:: bash
 
+   # On Linux and Mac OS X
    $ source activate numpy16
+   
+   # On Windows
+   > activate numpy16
 
 This puts the bin directory of the ``numpy16`` environment in the front of the
 ``PATH``, and sets it as the default environment for all subsequent conda commands.
@@ -84,7 +88,11 @@ To go back to the root environment, use
 
 .. code-block:: bash
 
+   # On Linux and Mac OS X
    $ source deactivate
+   
+   # On Windows
+   > deactivate
 
 
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