added composite sample

composite/src/main/java/com/iluwatar/Sentence.java

@@ -0,0 +1,24 @@
+package com.iluwatar;
+
+import java.util.List;
+
+public class Sentence extends LetterComposite {
+
+	public Sentence(List<Word> words) {
+		for (Word w: words) {
+			this.add(w);
+		}
+	}
+	
+	@Override
+	protected void printThisBefore() {
+		// nop
+	}
+
+	@Override
+	protected void printThisAfter() {
+		System.out.print(".");
+	}
+
+
+}