#496 Pipeline pattern (#967)

* #496 Add pipeline module to parent pom ✨

* #496: Add main application class and test for pipeline

* #496: Checkstyle format and add log messages on pipeline stages 🎨

* #496: Fill readme sections of pipeline ✨

* #496: Javadocs and checkstyle formatting 🎨

* #496: Follow PMD checks and add more explanation as block comment on App.java

* #496: Apply requested PR changes by iluwatar 🎨

pom.xml

@@ -97,6 +97,7 @@
         <module>property</module>
         <module>intercepting-filter</module>
         <module>producer-consumer</module>
+        <module>pipeline</module>
         <module>poison-pill</module>
         <module>reader-writer-lock</module>
         <module>lazy-loading</module>