Asciidoc merge request (#2128)

* - added classes for asciidoctor article
- added tests for that article
- added exclusion in pom.xml in libraries

* - fixed test

* - fixed formating in pom

* - added dependency to the pom.xml
- created plugin in pom.xml

libraries/src/main/java/com/baeldung/asciidoctor/AsciidoctorDemo.java

@@ -23,6 +23,7 @@ public class AsciidoctorDemo {
           .backend("pdf")
           .asMap();
 
+
         final String outfile = asciidoctor.convertFile(new File("sample.adoc"), options);
     }