Add property sheet to allow easily configure projects using wx

This seems to be the simplest possible way to let a MSVS project use the
library.

docs/changes.txt

@@ -168,6 +168,7 @@ wxMSW:
 - Improve wxNotebook themed background drawing (Arrigo Marchiori).
 - Send wxEVT_WEBVIEW_NAVIGATING when redirecting (Josue Andrade Gomes).
 - Fix build with MSVS 2005 broken in 3.1.1.
+- Add wxwidgets.props property sheet file for MSVS users.
 
 wxOSX:
 

docs/msw/install.md

@@ -505,6 +505,10 @@ The full list of the build settings follows:
 Building Applications Using wxWidgets  {#msw_build_apps}
 =====================================
 
+If you use MSVS 2010 or later IDE for building your project, simply add
+`wxwidgets.props` property sheet to (all) your project(s) using wxWidgets.
+You don't need to do anything else.
+
 If you want to use CMake for building your project, please see
 @ref overview_cmake.