First, make sure to do the steps from README.md so you have a working dev environment!
Drag and drop CMakeLists.txt to CLion project manager to add new cmake-based project, then add necessary profiles (hit the + symbol 3x):
In Settings > Plugins, install EditorConfig and restart the IDE.
To enable ClangFormat support, install LLVM bundle on your system and make sure you can run clang-format from terminal. Then, go to Settings > Editor > Code Style and check the Enable ClangFormat flag.
Hit Ctrl+Alt+S to reformat code or optionally enable reformat on save by going to Settings > Tools > Actions on Save:
Now you have the full power of CLion and CMake at posession.