[#31] Filled image with just one buffer because it was easier

config/Sources.cmake

include/vkcv/BufferManager.hpp

include/vkcv/Handles.hpp

include/vkcv/Image.hpp

src/vkcv/BufferManager.cpp

src/vkcv/Core.cpp

src/vkcv/Image.cpp

src/vkcv/ImageManager.cpp

src/vkcv/ImageManager.hpp