Have people commit to organize

[dcwalk]

Would be good for 2018 people (after thought! no pressure!) to add their name as an organizer @here: https://github.com/ournetworks/2019/blob/master/README.md#organizers

... as sort of a way of making it official that they are in for 2019 :))

• [x] set up gh teams to manage notifications/scope to 2019 organizers
• [x] add spot in readme for people to add themselves

[dcwalk]

Done!