Initialization Process for CEFI-regional-MOM6

[yichengt900]

As titled, the initial version of CEFI-regional-MOM6 is going to contain the following components:

File/directory	Purpose
LICENSE.md	A copy of the Gnu lesser general public license, version 3.
README.md	This file with basic pointers to more information.
src/	Contains the source code for CEFI-regional-MOM6
builds/	Contains build script to build MOM6-SIS2-cobalt
diagnostics/	Contains python scripts that can be utilized for analyzing model results after postprocessing.
exps/	Contains 1D mom6-cobalt exmaple and NWA12 configurtions.
tools/	Contains tools that can be used to generate initial conditions (ICs), boundary conditions (BCs), and other required inputs for MOM6-SIS2-cobalt model runs.
xmls/	Contains FRE xml files designed for running the CEFI-regional-MOM6 workflow on NOAA Gaea C5.

This PR is ready.