Added observer

src/main/java/edu/ntnu/idatt2003/mappevurderingprog2/controllers/GameController.java

+package edu.ntnu.idatt2003.mappevurderingprog2.controllers;
+
+import edu.ntnu.idatt2003.mappevurderingprog2.models.chaos.ChaosGame;
+import edu.ntnu.idatt2003.mappevurderingprog2.models.chaos.ChaosGameDescription;
+import javafx.event.ActionEvent;
+import javafx.event.EventHandler;
+
+public class GameController {
+  public void setChaosGameDescription(ChaosGameDescription description) {
+    ChaosGame.getInstance().setDescription(description);
+  }
+
+  public void setChaosCanvasSize(int width, int height) {
+    ChaosGame.getInstance().setCanvas(width, height);
+  }
+}