add readme for packaging

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@28497 a592a061-630c-0410-9148-cb99ea01b6c8

diff --git a/development/lyx.package.README b/development/lyx.package.README
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+Here is what to do to make a binary packages using CMake.
+
+Build LyX on your target system ad build the package with cpack:
+cpack -G <generator> --config CPackConfig.cmake 
+
+Choose <generator> dependent on your system:
+DEB, RPM, TGZ, NSIS, and others
+
+See also:
+http://www.cmake.org/Wiki/CMake:CPackPackageGenerators
+http://www.cmake.org/cmake/help/cpack2.6docs.html
+