Started on third example

compile_commands.json

dune/phasefield/initial_fn.hh

dune/phasefield/localoperator/fem_ff_chns_navierstokes.hh

dune/phasefield/localoperator/fem_ffs_chns_r_monolithic.hh

src/CMakeLists.txt

src/example_2p_cahnhilliard/2p_driver.hh

src/example_2p_cahnhilliard_navierstokes/2p_driver.hh

src/example_2p_cahnhilliard_navierstokes/chns2p.ini

src/example_3p_ffs_monolithic/3p_driver.hh

src/example_3p_ffs_monolithic/3p_ffs_monolithic.cc

src/example_3p_ffs_monolithic/CMakeLists.txt

src/example_3p_ffs_monolithic/chns3p.ini

...ple_3p_ffs_monolithic/grids/rectangle_periodic_coarse.msh

src/paper_thinstrip_full/3p_driver_monolithic.hh