emacs: fix spelling mistake and add title for README

Signed-off-by: Micky Ching <mickyching@163.com>
emacs: add ctags jump key

Signed-off-by: Micky Ching <mickyching@163.com>
emacs: add org-latex-book-cn class and auto insert

Signed-off-by: Micky Ching <mickyching@163.com>
emacs: add emacs command table

Signed-off-by: Micky Ching <mickyching@163.com>