sh: add emacs start scripts

emacs.sh      - start emacs
emd.sh        - start emacs daemon
emc.sh        - start emacs client

Signed-off-by: Micky Ching <mickyching@163.com>
tool: add checkpatch.pl from linux kernel

Signed-off-by: Micky Ching <mickyching@163.com>
sh: add patch and source code check script

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