[refactor]add gitignore
[refactor]add gitignore

szwang/OmniBooks,yoshi415/OmniBooks,yoshioka-s/OmniBooks,SillyKnight/OmniBooks,szwang/OmniBooks,yoshioka-s/OmniBooks,Mavmeister/KrakenBooks,Mavmeister/KrakenBooks,SillyKnight/OmniBooks,yoshi415/OmniBooks