added command sample

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

@@ -0,0 +1,31 @@
+package com.iluwatar;
+
+public abstract class Target {
+
+	private Size size;
+
+	private Visibility visibility;
+	
+	public Size getSize() {
+		return size;
+	}
+
+	public void setSize(Size size) {
+		this.size = size;
+	}
+
+	public Visibility getVisibility() {
+		return visibility;
+	}
+
+	public void setVisibility(Visibility visibility) {
+		this.visibility = visibility;
+	}
+
+	@Override
+	public abstract String toString();
+	
+	public void printStatus() {
+		System.out.println(String.format("%s, size=%s visibility=%s", this, getSize(), getVisibility()));
+	}
+}