added dqs example to the cmakelists.txt

Former-commit-id: a81783c9407860c8f24e03c0bfe009eea716897e

tutorial/CMakeLists.txt

@@ -41,6 +41,7 @@ add_subdirectory("305_QuadraticProgramming")
 add_subdirectory("401_BiharmonicDeformation")
 add_subdirectory("402_PolyharmonicDeformation")
 add_subdirectory("403_BoundedBiharmonicWeights")
+add_subdirectory("404_DualQuaternionSkinning")
 
 # Chapter 5
 add_subdirectory("501_HarmonicParam")