Add instructions for the gdas_init utility to readthedocs

[GeorgeGayno-NOAA]

DESCRIPTION OF CHANGES:

Add section to readthedocs for the gdas_init utility.

TESTS CONDUCTED:

N/A

DEPENDENCIES:

NOAA-EMC/global-workflow#2397

DOCUMENTATION:

https://georgegayno-noaaufs-utils.readthedocs.io/en/gi_doc/ufs_utils.html#gdas-init

ISSUE:

Fixes #915.

[GeorgeGayno-NOAA]

@CatherineThomas-NOAA and @JessicaMeixner-NOAA - Please review.

[JessicaMeixner-NOAA]

@GeorgeGayno-NOAA this is great! Thank you so much for adding this documentation here. I'm good with this as is, but one place we might point out is the set_fixed_files.sh file and that it's where the ocean resolutions are set as I think some people might be interested in where that is set and how to change if needed. Thanks again for adding this!

[CatherineThomas-NOAA]

@GeorgeGayno-NOAA Looks great. I second Jessica's comment about the ocean resolution. Thanks so much for addressing this so quickly!

[KateFriedman-NOAA]

Looks great, thanks for adding this @GeorgeGayno-NOAA after we removed it from the global-workflow RTD. Left a few minor comments to consider but I approve pending other reviewer comments.

Once this is in, I will add the link to the UFS_UTILS RTD from the global-workflow RTD so users are directed there for making ICs.

[GeorgeGayno-NOAA]

@GeorgeGayno-NOAA Looks great. I second Jessica's comment about the ocean resolution. Thanks so much for addressing this so quickly!

@JessicaMeixner-NOAA and @CatherineThomas-NOAA - is this OK? 4d85a39

[JessicaMeixner-NOAA]

@GeorgeGayno-NOAA thank you so much for that update! I think it is clear and will be really helpful to many users!

[CatherineThomas-NOAA]

Looks great @GeorgeGayno-NOAA. Thanks!

[GeorgeGayno-NOAA]

Looks great, thanks for adding this @GeorgeGayno-NOAA after we removed it from the global-workflow RTD. Left a few minor comments to consider but I approve pending other reviewer comments.

Once this is in, I will add the link to the UFS_UTILS RTD from the global-workflow RTD so users are directed there for making ICs.

Just merged it. Point to this location: https://noaa-emcufs-utils.readthedocs.io/en/latest/

[KateFriedman-NOAA]

Point to this location: https://noaa-emcufs-utils.readthedocs.io/en/latest/

Great, thanks @GeorgeGayno-NOAA !