ubuntu: add tips

Signed-off-by: Micky Ching <mickyching@gmail.com>
index: modify structure

Signed-off-by: Micky Ching <mickyching@gmail.com>
vfs: slide: add figures

Signed-off-by: Micky Ching <mickyching@gmail.com>
add linux kernel coding style

Signed-off-by: Micky Ching <mickyching@gmail.com>
index: modify structure

Signed-off-by: Micky Ching <mickyching@gmail.com>
uevent: add mdev notes

Signed-off-by: Micky Ching <mickyching@gmail.com>
uevent: add mdev config

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