Add mpas2esmf - A Fortran utility for generating SCRIP and ESMF files

This commit adds a new Fortran utility that can be used for creating SCRIP and ESMF files from MPAS grids. Currently, this tool is used to generate SCRIP files for MPAS-Atmosphere in CESM.
MPAS-Dev · May 18, 2021 · ea76e6e · ea76e6e
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diff --git a/mesh_tools/mpas2esmf/.gitignore b/mesh_tools/mpas2esmf/.gitignore
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+mpas2esmf
diff --git a/mesh_tools/mpas2esmf/Makefile b/mesh_tools/mpas2esmf/Makefile
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+FC = $(shell nc-config --fc)
+FCINCLUDES = $(shell nc-config --fflags)
+FCLIBS = $(shell nc-config --flibs)
+
+all: mpas2esmf.f90
+	$(FC) -o mpas2esmf mpas2esmf.f90 ${FCINCLUDES} ${FCLIBS}
+
+clean:
+	rm -f mpas2esmf read_mesh.mod write_desc.mod
diff --git a/mesh_tools/mpas2esmf/README.md b/mesh_tools/mpas2esmf/README.md
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+# mpas2esmf
+
+This tool generates ESMF and SCRIP files from an MPAS grid file. To avoid
+complications with CESM/CAM infrastructure tools, this tool should only be ran
+on grids that have a `sphere_radius = 1`. 
+
+To build, ensure `nc-config` is in your $PATH and call `make`.
+
+By default, the ESMF and SCRIP NetCDF files created are 64BIT offset format.