Add CMakeLists.txt and rename demo

Convex_decomposition_3/demo/Convex_decomposition_3/CMakeLists.txt

@@ -0,0 +1,30 @@
+# This is the CMake script for compiling a CGAL application.
+
+project( Convex_decomposition_3 ) 
+
+CMAKE_MINIMUM_REQUIRED(VERSION 2.4.5)
+
+set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
+
+find_package(CGAL REQUIRED Qt3 )
+include( ${CGAL_USE_FILE} )
+
+find_package(Qt3-patched QUIET)
+# FindQt3-patched.cmake is FindQt3.cmake patched by CGAL developers, so
+# that it can be used together with FindQt4: all its variables are prefixed
+# by "QT3_" instead of "QT_".
+
+if ( CGAL_FOUND AND QT3_FOUND )
+
+
+  # The executable itself.
+  add_executable  ( convex_decomposition_3
+                    convex_decomposition_3.cpp )
+
+  target_link_libraries( nef_2 ${CGAL_LIBRARIES}  ${CGAL_3RD_PARTY_LIBRARIES})
+
+else()
+
+  message(STATUS "NOTICE: This demo requires CGAL and Qt3, and will not be compiled.")
+
+endif()