Added some readme notes for including zipdll into nsis configuration

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@6334 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: timlinux

win_build/README.txt

@@ -0,0 +1,13 @@
+ Notes for using NSIS installer scripts.
+
+             Tim Sutton 2006
+---------------------------------------
+
+The installer script has an optional data
+download part. This requires an NSIS 
+plugin available here:
+
+http://nsis.sourceforge.net/ZipDLL_plug-in
+
+Follow the instructions on that page before
+attempting to run the installer.