Added simple bedrock layer generator.

src/main/java/ca/recrown/islandsurvivalcraft/worldgen/BedrockGenerator.java

@@ -0,0 +1,22 @@
+package ca.recrown.islandsurvivalcraft.worldgen;
+
+import java.util.Random;
+
+import org.bukkit.util.noise.SimplexOctaveGenerator;
+
+public class BedrockGenerator {
+    private SimplexOctaveGenerator noiseGenerator;
+    private final int maxBedrockHeight = 5;
+    private final int minBedrockHeight = 1;
+    public BedrockGenerator(Random random) {
+        noiseGenerator = new SimplexOctaveGenerator(random, 8);
+        noiseGenerator.setScale(0.1D);
+    }
+
+    private double getNormalizedNoise(int worldX, int worldZ) {
+        return (noiseGenerator.noise(worldX, worldZ, 0.5D, 0.5D, true) + 1D) / 2D;
+    }
+    public int getBedrockHeight(int worldX, int worldZ) {
+        return (int) Math.min(minBedrockHeight, getNormalizedNoise(worldX, worldZ) * maxBedrockHeight);
+    }
+}