1 . Add the VanillaStyle as a Git submodule.
git submodule add https://github.com/AlanusMeminius/VanillaStyle.git submodules/VanillaStyle
2 . Download submodules.
git submodule update --init --recursive
3 . Add the library to Cmake project.
add_subdirectory(submodules/VanillaStyle)
4 . Link the library.
target_link_libraries(${PROJECT_NAME} VanillaStyle)