added memento sample

memento/src/main/java/com/iluwatar/StarMementoInternal.java

@@ -0,0 +1,27 @@
+package com.iluwatar;
+
+public class StarMementoInternal implements StarMemento {
+
+	private StarType type;
+	private int ageYears;
+	private int massTons;
+	
+	public StarType getType() {
+		return type;
+	}
+	public void setType(StarType type) {
+		this.type = type;
+	}
+	public int getAgeYears() {
+		return ageYears;
+	}
+	public void setAgeYears(int ageYears) {
+		this.ageYears = ageYears;
+	}
+	public int getMassTons() {
+		return massTons;
+	}
+	public void setMassTons(int massTons) {
+		this.massTons = massTons;
+	}
+}