Changes to README

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
removing my earlier video-chat demo

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Added super simple webrtc example

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>