Add the config of emacs for c-style and lua style.

N/A

config emacs as follows:
1. cp dotemacs ~/.emacs
2. cp google-c-style.el ~/.emacs.d/plugins/google-c-style.el
3. cp lua-mode.el ~/.emacs.d/plugins/lua-mode.el

Signed-off-by: liminghao <liminghao@xiaomi.com>