BAEL-2789 - The Dependency Inversion Principle in Java (#6613)

* Initial Commit

* Added dip dipmodular modules to pom.xml

* Delete pom.xml

* Add pom.xml

* Update pom.xml

* Update pom.xml

* Update pom.xml

* Update Application.java

* Update CustomerDaoUnitTest.java

* Update CustomerServiceUnitTest.java

* Update Application.java

* Update CustomerDaoUnitTest.java

* Update CustomerServiceUnitTest.java

* Update CustomerDaoUnitTest.java

* Update CustomerServiceUnitTest.java

patterns/pom.xml

@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>patterns</artifactId>
     <packaging>pom</packaging>
-	<name>patterns</name>
+    <name>patterns</name>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -19,6 +19,7 @@
         <module>design-patterns</module>
         <module>design-patterns-2</module>
         <module>solid</module>
+        <module>dip</module>     
     </modules>
 
     <dependencyManagement>
@@ -55,4 +56,4 @@
         <jetty-maven-plugin.version>9.4.0.v20161208</jetty-maven-plugin.version>
     </properties>
 
-</project>
+</project>