added command sample

command/src/main/java/com/iluwatar/Goblin.java

@@ -0,0 +1,15 @@
+package com.iluwatar;
+
+public class Goblin extends Target {
+
+	public Goblin() {
+		this.setSize(Size.NORMAL);
+		this.setVisibility(Visibility.VISIBLE);
+	}
+	
+	@Override
+	public String toString() {
+		return "Goblin";
+	}
+
+}