Added rough roadmap.

ROADMAP.md

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+# Proxima Roadmap
+
+This is an approximate roadmap.  Development of associated mobile apps not
+included, likely somewhere in Phase 2.
+
+## Phase 1
+* Initial proof of concept, passing chunks over IPFS
+* Desktop GTK prototype with audio/video (gstreamer)
+* Standalone broadcast client (RTSP?)
+* Support for streaming from OBS to broadcast client
+
+## Phase 2
+* Transcode to multiple resolutions in broadcast client (ffmpeg?)
+* Broadcast client auth to facilitate offloading transcode
+* Custom UDP-based gossip protocol, with preemptive chunk relay (!!!)
+* Discovery platform, possibly web-based
+* Realtime chat per stream (IPFS pubsub?)
+
+## Phase 3
+* Erasure codes or fountain codes to improve reliability of distribution
+* ActivityPub support to enhance discovery
+* Archive streams on PeerTube?
+* WebRTC-based in-browser stream preview