Add hand written notes

_notes/fourier_examples.md

_psets/08.md

_psets/09.md

_psets/10.md

assets/img/notes_ft_examples_1.jpg

assets/img/notes_ft_examples_2.jpg

assets/img/notes_ft_examples_3.jpg

assets/img/pset10_1.jpg

assets/img/pset10_2.jpg

assets/img/pset8_1.jpg

assets/img/pset8_2.jpg

assets/img/pset8_3.jpg

assets/img/pset9_1.jpg

assets/img/pset9_2.jpg

assets/img/pset9_3.jpg

assets/img/pset9_4.jpg

assets/img/pset9_5.jpg

assets/img/pset9_6.jpg

project.md