Add example plots

.gitignore

tutorials/tutorial_nb_data/chainplot_00.png

tutorials/tutorial_nb_data/chainplot_01.png

tutorials/tutorial_nb_data/chainplot_02.png

tutorials/tutorial_nb_data/cornerplot_00.png

tutorials/tutorial_nb_data/cornerplot_01.png

tutorials/tutorial_nb_data/cornerplot_02.png

tutorials/tutorial_nb_data/cornerplot_03.png

tutorials/tutorial_nb_data/lnlike.png

tutorials/tutorial_nb_data/preprocess_measurement_uncert.png

tutorials/tutorial_nb_data/preprocess_theta.png

tutorials/tutorial_nb_data/reflecplot.png