Checkin pending Discovering Rooms features spec

[user512]

Connects: #39
Checking this in while working on discovering rooms feature so we don't forget.

[zspencer]

This looks great! I think one other thing to consider is back-linking to the Github Issue that includes the feature definition so that people can find the historical context.

[zspencer]

I think I'd prefer we use @wip on scenarios for the work that is actually in flight; and maybe use @unstarted for the scenarios that have not yet been picked up. We can use @unscheduled for feature definitions that we are contemplating but have not yet decided which release they go in to.

We'll probably also want to add and not @unstarted to the test script in package.json