Added more detailed information how to connect Zephyr instance
to host system like Linux desktop.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Don't include net_app.h and net_buf.h, the first is deprecated, the
latter is low-level header, both shouldn't be used for socket apps.
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>