Add README for running atmos-only C192 test on Orion#408

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KateFriedman-NOAA merged 1 commit intoNOAA-EMC:feature/coupled_sprintfrom KateFriedman-NOAA:feature/coupled_sprint

Aug 13, 2021

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Commits on Aug 13, 2021

Add temporary README with instructions for running atmos-only C192 test on Orion
KateFriedman-NOAA
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