Add first compilable version

CMakeLists.txt

runtime/boundary_weights.cpp

runtime/boundary_weights.hpp

runtime/copper_fcc_lattice.cpp

runtime/copper_fcc_lattice.hpp

runtime/dem_sc_grid.cpp

runtime/dem_sc_grid.hpp

runtime/device_flags.hpp

runtime/devices/device.hpp

runtime/domain/block_forest.hpp

runtime/pairs.cpp

runtime/pairs.hpp

runtime/property.hpp

runtime/read_from_file.cpp

runtime/read_from_file.hpp

runtime/stats.cpp

runtime/stats.hpp

runtime/thermo.cpp

runtime/thermo.hpp

runtime/timing.cpp