feat: Implement View Helper pattern (#3278)

* #1263 - creating new module for view-helper

* #1263 - creating Product and ProductViewModel

* #1263 - creating interfaces for View and ViewHelper

* #1263 - creating ProductViewHelper and its test

* #1263 - creating Console View for Product

* #1263 - creating ProductController

* #1263 - creating main App and its test

* #1263 - adding license header

* #1263 - keeping module in alphabetical order

* #1263 - creating README and diagrams

* #1263 apply spotless

---------

Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>

pom.xml

@@ -71,7 +71,6 @@
     <sonar.projectName>Java Design Patterns</sonar.projectName>
   </properties>
   <modules>
-
     <module>abstract-document</module>
     <module>abstract-factory</module>
     <module>active-object</module>
@@ -244,11 +243,11 @@
     <module>update-method</module>
     <module>value-object</module>
     <module>version-number</module>
+    <module>view-helper</module>
     <module>virtual-proxy</module>
     <module>visitor</module>
     <module>backpressure</module>
     <module>actor-model</module>
-
   </modules>
   <repositories>
     <repository>