Add doxygen #9

Job	Run time
check_docker_files	5s
lint	8s
build_base	0s
build (openmp, gcc, g++, -DKokkos_ENABLE_OPENMP=ON, native)	2m 2s
build (cuda, gcc, g++, -DKokkos_ENABLE_CUDA=ON -DKokkos_ARCH_AMPERE80=ON, native)	5m 12s
build (cuda, gcc, g++, -DKokkos_ENABLE_CUDA=ON -DKokkos_ARCH_AMPERE80=ON, host_device, -DKokkosFF...	5m 51s
build (hip, hipcc, hipcc, -DKokkos_ENABLE_HIP=ON -DKokkos_ARCH_VEGA90A=ON, native)	5m 56s
build (hip, hipcc, hipcc, -DKokkos_ENABLE_HIP=ON -DKokkos_ARCH_VEGA90A=ON, host_device, -DKokkosF...	4m 33s
build (sycl, icx, icpx, -DKokkos_ENABLE_SYCL=ON -DKokkos_ARCH_INTEL_GEN=ON, native)	8m 48s
build (sycl, icx, icpx, -DKokkos_ENABLE_SYCL=ON -DKokkos_ARCH_INTEL_GEN=ON, host_device, -DKokkos...	8m 25s
test (cuda, self-hosted, cuda)	3m 42s
test (openmp, ubuntu-latest)	18s
	45m 0s

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