Added README.md

Author: orso82

README.md

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+AToM project
+============
+
+This repository contains the Makefile that allows the download, update, and build of all AToM components.
+To use it:
+
+```bash
+git clone [email protected]:scidac/atom_repo.git
+cd atom_repo
+make CONFIG plat=???
+```
+
+where `plat` can be one of the following:
+
+```
+ALCF_BGP ALCF_CETUS BABBAGE BANACH CAOS CARVER CMODWS DELPHI
+DROP EDISON_CRAY EDISON_INTEL FT GFORTRAN_CORE2 GFORTRAN_OSX
+GFORTRAN_OSX_64 GFORTRAN_OSX_BELLI GFORTRAN_OSX_MACPORTS
+GFORTRAN_OSX_TECHX GFORTRAN_PENRYN GFORTRAN_TECHX HOPPER_CRAY
+HOPPER_INTEL HPC_ITER IFORT_CORE2 IFORT_PENRYN JAC LINDGREN
+LOHAN LOKI LOKI_SCRATCH METIUS NEWT OSX_MOUNTAINLION PACER
+PGFORTRAN_OSX PG_OPT64 PG_OPT64_FFTW PG_OPT64_MUMPS PPPL
+PPPL_PATHSCALE RANGER SATURN TITAN_CRAY VENUS
+```