DOC: Adding a README file for cmac2.0. Contains background information and a link to CMAC on the ARM climate facility website.
DOC: Adding a README file for cmac2.0.
Contains background information and a link to CMAC on the ARM climate
facility website.

zssherman/cmac2.0,EVS-ATMOS/cmac2.0,zssherman/cmac2.0,EVS-ATMOS/cmac2.0