Add PolyWorld to lineup

README.markdown

@@ -238,6 +238,7 @@ Here's a list of modules bundled with the game by default (as of this writing an
 * [Oreons](https://github.com/Terasology/Oreons) - little sentient cookie people! Don't do much yet. Place with `spawnPrefab OreonGuard` in the console (other types exist)
 * [Pathfinding](https://github.com/Terasology/Pathfinding) - framework for pathfinding used by other modules
 * [PlantPack](https://github.com/Terasology/PlantPack) - more plants! Used by the Throughout the Ages gameplay
+* [PolyWorld](https://github.com/Terasology/PolyWorld) - creates very neat island worlds based on the [map generating algorithm by Amit Patel of Red Blob Games](http://www-cs-students.stanford.edu/~amitp/game-programming/polygon-map-generation/)
 * [Portals](https://github.com/Terasology/Portals) - allows placement of portal blocks that'll spawn Oreons `giveBlock portal`
 * ~~[Rails](https://github.com/Terasology/Rails) - railroads and trains! Press 'e' to start a caboose or enter a cart. Use the wrench to attach carts~~ (broken, waiting for author's return)
 * [Sample](https://github.com/Terasology/Sample) - miscellaneous example content showcasing module usage