Hardcoding Swarmix_net stream to "stream number" 7

This is a test to see if Swarmix_net will be sent again by this change.
Can't test it anymore, but hope that it will work (fully) now.

Signed-off-by: Simon Egli <simon.egli@tik.ee.ethz.ch>
Adding readme to the repo

Signed-off-by: Simon Egli <simon.egli@tik.ee.ethz.ch>