added initial version of the Doxygen manual

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51901 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/windowstyles.h

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+/////////////////////////////////////////////////////////////////////////////
+// Name:        windowstyles
+// Purpose:     topic overview
+// Author:      wxWidgets team
+// RCS-ID:      $Id$
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/*!
+ 
+ @page windowstyles_overview Window styles
+ 
+ Window styles are used to specify alternative behaviour and appearances for windows, when they are
+ created. The symbols are defined in such a way that they can be combined in a 'bit-list' using the
+ C++ @e bitwise-or operator. For example:
+ 
+ @code
+ wxCAPTION | wxMINIMIZE_BOX | wxMAXIMIZE_BOX | wxRESIZE_BORDER
+ @endcode
+ 
+ For the window styles specific to each window class, please see the documentation
+ for the window. Most windows can use the generic styles listed for #wxWindow in
+ addition to their own styles.
+ 
+ */
+ 
+