Introduction to Ascii doctor (#2069)

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

* - fixed test

* - fixed formating in pom

libraries/src/test/java/com/baeldung/asciidoctor/AsciidoctorDemoTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.asciidoctor;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class AsciidoctorDemoTest {
+
+    @Test
+    public void givenString_whenConverting_thenResultingHTMLCode() {
+        final AsciidoctorDemo asciidoctorDemo = new AsciidoctorDemo();
+        Assert.assertEquals(asciidoctorDemo.generateHTMLFromString("Hello _Baeldung_!"), "<div class=\"paragraph\">\n<p>Hello <em>Baeldung</em>!</p>\n</div>");
+    }
+}