Added some creatures.

specification/src/main/java/com/iluwatar/KillerBee.java

@@ -0,0 +1,8 @@
+package com.iluwatar;
+
+public class KillerBee extends AbstractCreature {
+
+	public KillerBee() {
+		super("KillerBee", Size.SMALL, Movement.FLYING, Color.LIGHT);
+	}
+}

specification/src/main/java/com/iluwatar/Shark.java

@@ -0,0 +1,8 @@
+package com.iluwatar;
+
+public class Shark extends AbstractCreature {
+
+	public Shark() {
+		super("Shark", Size.NORMAL, Movement.SWIMMING, Color.LIGHT);
+	}
+}

specification/src/main/java/com/iluwatar/Troll.java

@@ -0,0 +1,8 @@
+package com.iluwatar;
+
+public class Troll extends AbstractCreature {
+	
+	public Troll() {
+		super("Troll", Size.LARGE, Movement.WALKING, Color.DARK);
+	}
+}