Update introduction.rst

* Added steps for installation of python modules 'magento' and 'pycountry'
  required by openERP 'magento_integration' module.

Author: capitaine

doc/source/introduction.rst

@@ -88,7 +88,17 @@ System >> Magento Connect >> Magento Connect Manager
 
 **Step 2: Installation of Magento Integration [OpenERP module]**
 
-**Downloading the module**
+**Preparation of the Python environment**
+
+1. If not already installed by the default python installation, download the pycountry module and install it in your python directory
+
+2. Download the `magento module <https://github.com/openlabs/magento>`_ and install it in your python directory (*)
+
+(*) it seems that in linux installations, Magento Integration takes care of 'magento module' and installs it when running the Magento Integration setup (see .5 below). So you have to install it yoursefl only if you are working under windows systems because for some reason Magento Integration lacks to install the 'magento module' (to be confirmed by developers)
+
+(if your openERP is installed on a Windows system, copy the above modules from YourPythonDir\\Lib\\site-packages to YourOpenErpDir\\Server\\server)
+
+**Downloading the magento_integration module**
 
 1. The module source is available online and can be downloaded from
    `here <https://github.com/openlabs/magento_integration>`_.