adding sample book chapters 5 6 7 index
adding sample book chapters 5 6 7 index

mushroomgithub/HTMLBook,oreillymedia/HTMLBook,gitenberg-dev/HTMLBook,gitenberg-dev/HTMLBook,macmillanpublishers/HTMLBook,oreillymedia/HTMLBook,mushroomgithub/HTMLBook,gitenberg-dev/HTMLBook,wastemobile/HTMLBook,oreillymedia/HTMLBook,wastemobile/HTMLBook,macmillanpublishers/HTMLBook,macmillanpublishers/HTMLBook,mushroomgithub/HTMLBook