feature partitioning: add documentation #127

Job	Run time
CMake build on MacOS	1m 37s
CMake Serial Minimal Build on Linux	55s
CMake Serial With Clawpack Build on Linux	59s
CMake Serial With Clawpack and HDF Build on Linux	1m 53s
CMake Serial With GeoClaw Build on Linux	48s
CMake Serial With CudaClaw (CUDA 10.1) Build on Linux	2m 28s
CMake Serial With CudaClaw (CUDA 11.3) Build on Linux	3m 4s
CMake MPI Minimal Build on Linux	58s
CMake MPI With Clawpack Build on Linux	1m 5s
CMake MPI With Clawpack and HDF Build on Linux	1m 54s
CMake MPI With GeoClaw Build on Linux	1m 42s
CMake MPI With CudaClaw (CUDA 10.1) Build on Linux	2m 39s
CMake MPI With CudaClaw (CUDA 11.3) Build on Linux	3m 26s
CMake MPI With ThunderEgg Build on Linux	59s
	24m 27s

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