Move English documentation to folder en_US

doc/en_US/windows-iis-installation.markdown

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+Installation on Windows 2008/2012 with IIS
+==========================================
+
+This guide will help you to setup step by step Kanboard on a Windows Server with IIS and PHP.
+
+PHP installation
+----------------
+
+- Install IIS on your server (Add a new role and don't forget to enable CGI/FastCGI)
+- Install PHP by following the official documentation:
+    - [Microsoft IIS 5.1 and IIS 6.0](http://php.net/manual/en/install.windows.iis6.php)
+    - [Microsoft IIS 7.0 and later](http://php.net/manual/en/install.windows.iis7.php)
+    - [PHP for Windows is available here](http://windows.php.net/download/)
+
+
+### PHP.ini
+
+You need at least, these extensions in your `php.ini`:
+
+```ini
+extension=php_gd2.dll
+extension=php_ldap.dll
+extension=php_mbstring.dll
+extension=php_openssl.dll
+extension=php_pdo_sqlite.dll
+```
+
+The complete list of required PHP extensions is available on the [requirements page](requirements.markdown)
+
+Do not forget to set the time zone:
+
+```ini
+date.timezone = America/Montreal
+```
+
+The list of supported time zones can be found in the [PHP documentation](http://php.net/manual/en/timezones.america.php).
+
+Notes:
+
+- If you use PHP < 5.4, you have to enable the short tags in your php.ini
+- Don't forget to enable the required php extensions mentioned above
+- If you got an error about "the library MSVCP110.dll is missing", you probably need to download the Visual C++ Redistributable for Visual Studio from the Microsoft website.
+
+IIS Modules
+-----------
+
+The Kanboard archive contains a `web.config` file to enable [URL rewriting](nice-urls.markdown). 
+This configuration require the [Rewrite module for IIS](http://www.iis.net/learn/extensions/url-rewrite-module/using-the-url-rewrite-module).
+
+If you don't have the rewrite module, you will get an internal server error (500) from IIS.
+If you don't want to have Kanboard with nice URLs, you can remove the file `web.config`.
+
+Kanboard installation
+---------------------
+
+- Download the zip file
+- Decompress the archive in `C:\inetpub\wwwroot\kanboard` by example
+- Make sure the directory `data` is writable by the IIS user
+- Open your web browser to use Kanboard http://localhost/kanboard/
+- The default credentials are **admin/admin**
+- [URL rewrite configuration](nice-urls.markdown)
+
+Notes
+-----
+
+- Some features of Kanboard require that you run [a daily background job](cronjob.markdown).
+