Add wormhole teleportation rules

RULESET.md

@@ -6,3 +6,24 @@
 
 - Iris uses xorshift32 for randomisation.
 - The seed is set once at the beginning through user input. You can add more ways to set the seed, but the user has to be able to set it themselves.
+
+### World
+
+- The world is a 256x256 grid of tiles called quadrants
+
+### Quadrants
+- Empty - 30% chance
+- Asteroid belt - 10% chance
+- Star system - 10% chance
+- Nebula - 10% chance
+- Black hole - 10% chance
+- White hole - 10% chance
+- Pulsar - 5% chance
+- Quasar - 5% chance
+- Supernova - 5% chance
+- Anomaly - 4% chance
+- Singularity - 1% chance
+
+### Wormholes
+
+- When entering a black hole, the player is teleported to a random white hole. If there are no white holes, the player is teleported to a random quadrant.