added Simple Salt Dome and Molasse examples

CHANGELOG.md

docs/examples/Molasse_Basin.md

docs/examples/Salt_Dome.md

docs/examples/Simple_Salt_Dome.md

docs/examples/Two_Layers.md

docs/examples/index.md

docs/examples/simple_salt_dome_create_lattice_3D_view.png

...ples/simple_salt_dome_extended_original_model_3D_view.png

docs/examples/simple_salt_dome_inversion_settings.png

docs/examples/simple_salt_dome_lattice_define_area.png

...examples/simple_salt_dome_lattice_define_optimal_area.png

docs/examples/simple_salt_dome_measured_gravity.png

docs/examples/simple_salt_dome_optimal_lattice_3D_view.png

docs/examples/simple_salt_dome_original_model_2D_view.png

docs/examples/simple_salt_dome_original_model_3D_view.png

docs/examples/simple_salt_dome_refine_lattice_3D_view.png

docs/examples/simple_salt_dome_starting_model_3D_view.png

docs/examples/simple_salt_dome_starting_model_residual.png

...simple_salt_dome_starting_model_residual_no_autoshift.png

docs/media/icon_2d_maps.png