update README

README.md

@@ -1,9 +1,21 @@
-# mozaic4
+# planetwars
+
+Planetwars is a competitive programming game. You implement a bot that will be pitted against all other bots.
+
+Currently a demo is available at https://demo.planetwars.dev.
+
+current features:
+- write your bot in python
+- save your bot so that others can play against it
+- saved bots are automatically ranked in the background.
+
+
+At the moment only python is supported, but a more generic docker-based system is in development.
 
-Because third time's the charm!
 
 Project layout:
 - `planetwars-server`: rust webserver
-- `planetwars-matchrunner`: implements the game
+- `planetwars-matchrunner`: code for running matches
+- `planetwars-rules`: implements the game rules
 - `web/pw-server`: frontend
 - `web/pw-visualizer`: code for the visualizer