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/referencenotes.h

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+/////////////////////////////////////////////////////////////////////////////
+// Name:        referencenotes
+// Purpose:     topic overview
+// Author:      wxWidgets team
+// RCS-ID:      $Id$
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/*!
+ 
+ @page referencenotes_overview Notes on using the reference
+ 
+ In the descriptions of the wxWidgets classes and their member
+ functions, note that descriptions of inherited member functions are not
+ duplicated in derived classes unless their behaviour is different. So in
+ using a class such as wxScrolledWindow, be aware that wxWindow functions may be
+ relevant.
+ Note also that arguments with default values may be omitted from a
+ function call, for brevity. Size and position arguments may usually be
+ given a value of -1 (the default), in which case wxWidgets will choose a
+ suitable value.
+ Most strings are returned as wxString objects. However, for remaining
+ char * return values, the strings are allocated and
+ deallocated by wxWidgets. Therefore, return values should always be
+ copied for long-term use, especially since the same buffer is often
+ used by wxWidgets.
+ The member functions are given in alphabetical order except for
+ constructors and destructors which appear first.
+ 
+ */
+ 
+