TODO: add oscilloscope dream as well

Signed-off-by: Nishanth Menon <nm@ti.com>
Makefile: add a help rule

Now, you can do make help to get guidance :)

Signed-off-by: Nishanth Menon <nm@ti.com>
README: add more information

README was the standard github readme.. so update it
with usage info.

Signed-off-by: Nishanth Menon <nm@ti.com>