Added docs and assets for camera geometry and projection

docs/assets/camera_geometry/Iss_WAC_ema_figure.png

docs/assets/camera_geometry/Iss_WAC_enceladus_sm2.png

docs/assets/camera_geometry/Iss_WAC_inc_figure.png

docs/assets/camera_geometry/Iss_WAC_lat_figure.png

docs/assets/camera_geometry/Iss_WAC_lon_figure.png

docs/assets/camera_geometry/Iss_WAC_phase_figure.png

docs/assets/map_projections/180_domain_correct.png

docs/assets/map_projections/360_domain_incorrect.png

docs/assets/map_projections/Blue_right_arrow.gif

docs/assets/map_projections/Cam2map_screenshot.jpeg

docs/assets/map_projections/MOC1.jpeg

docs/assets/map_projections/Mars_sphere_illustration.png

docs/assets/map_projections/Mercator.gif

docs/assets/map_projections/Mola_of_sheet2a_thumb.jpeg

docs/assets/map_projections/Mosaic_after.jpeg

docs/assets/map_projections/Mosaic_sinus.jpeg

docs/assets/map_projections/Sample_mosaic_themis.jpeg

docs/assets/map_projections/SimpleCylindrical.jpeg

docs/assets/map_projections/Simple_135-110.jpeg

docs/assets/map_projections/SinuMOC1.jpeg