build

Add root CMakeLists.txt #463

Job	Run time
mingw (MINGW64)	9m 4s
mingw (MINGW32)	9m 40s
macos	27m 28s
ubuntu (gcc with CUDA with OpenMP)	19m 28s
mingw (CLANG64)	11m 6s
msvc (with OpenMP)	7m 36s
ubuntu (gcc without CUDA with OpenMP)	11m 14s
mingw (CLANG32)	10m 43s
msvc (without OpenMP)	7m 43s
ubuntu (clang with CUDA with OpenMP)	13m 15s
ubuntu (clang without CUDA with OpenMP)	2h 10m 44s
ubuntu (gcc without CUDA without OpenMP)	11m 22s
	4h 29m 23s

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