add ToDos for descriptor set management.

config/Sources.cmake

include/vkcv/Core.hpp

include/vkcv/Descriptor.hpp

include/vkcv/Handles.hpp

include/vkcv/ResourcesConfig.hpp

src/vkcv/Core.cpp

src/vkcv/Descriptor.cpp

src/vkcv/DescriptorManager.cpp

src/vkcv/DescriptorManager.hpp

src/vkcv/ResourcesConfig.cpp