Added DAO pattern.

dao/src/main/java/com/iluwatar/DaoBase.java

@@ -0,0 +1,24 @@
+package com.iluwatar;
+
+public abstract class DaoBase<E extends BaseEntity> {
+
+	E find(Long id) {
+		
+	}
+	
+	void persist(E e) {
+		
+	}
+	
+	E merge(E e) {
+		
+	}
+	
+	void remove(E e) {
+		
+	}
+	
+	List<E> findAll() {
+		
+	}
+}