Add configuration file for Fortran Documenter (FORD)

This enables us to generate documentation for MPAS dynamical core.

src/dynamics/mpas/assets/ford-config.md

@@ -0,0 +1,33 @@
+---
+project: MPAS Dynamical Core
+summary: MPAS dynamical core solves the fully compressible non-hydrostatic equations of atmospheric motion.
+author: CAM-SIMA & MPAS Developers
+github: https://github.com/ESCOMP/CAM-SIMA
+website: https://sima.ucar.edu
+src_dir: ..
+exclude_dir: ../assets
+             ../dycore
+output_dir: ./ford
+extensions: F90
+            f90
+fixed_extensions: F
+                  f
+fixed_length_limit: false
+fpp_extensions: F
+                F90
+preprocess: true
+preprocessor: gfortran -E
+display: private
+         protected
+         public
+graph: true
+lower: true
+proc_internals: true
+search: false
+sort: alpha
+source: true
+---
+
+Model for Prediction Across Scales (MPAS) is one of the supported atmospheric dynamical cores in Community Atmosphere Model - System for Integrated Modeling of the Atmosphere (CAM-SIMA). CAM-SIMA is the next-generation atmospheric component of Community Earth System Model (CESM).
+
+This auto-generated documentation provides a developer's guide to the Fortran interface and subdriver of MPAS dynamical core.