Add doxygen #36

Job	Run time
lint	12s
check_docker_files / check_docker_files	3s
build_base	0s
build (openmp, gcc, gcc, g++, -DKokkos_ENABLE_OPENMP=ON, native)	3m 5s
build (threads, gcc, gcc, g++, -DKokkos_ENABLE_THREADS=ON, native)	2m 41s
build (serial, gcc, gcc, g++, -DKokkos_ENABLE_SERIAL=ON, native)	3m 2s
build (cuda, nvcc, gcc, g++, -DKokkos_ENABLE_CUDA=ON -DKokkos_ARCH_AMPERE80=ON, native)	6m 40s
build (cuda, nvcc, gcc, g++, -DKokkos_ENABLE_CUDA=ON -DKokkos_ARCH_AMPERE80=ON, host_device, -DKo...	5m 25s
build (hip, rocm, hipcc, hipcc, -DKokkos_ENABLE_HIP=ON -DKokkos_ARCH_VEGA90A=ON, native)	5m 50s
build (hip, rocm, hipcc, hipcc, -DKokkos_ENABLE_HIP=ON -DKokkos_ARCH_VEGA90A=ON, host_device, -DK...	6m 39s
build (sycl, intel, icx, icpx, -DKokkos_ENABLE_SYCL=ON -DKokkos_ARCH_INTEL_GEN=ON, native)	9m 52s
build (sycl, intel, icx, icpx, -DKokkos_ENABLE_SYCL=ON -DKokkos_ARCH_INTEL_GEN=ON, host_device, -...	9m 35s
test (cuda, nvcc, self-hosted, cuda)	11m 13s
test (openmp, gcc, ubuntu-latest)	2m 39s
test (threads, gcc, ubuntu-latest)	2m 46s
test (serial, gcc, ubuntu-latest)	2m 45s
	1h 12m 27s

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