code: public WarProbeOption library(String libraryPath) {
          libraries.add(new File(libraryPath).toURI().toString());
          return this;
      }
docs: Adds the library from the given path to the WAR. If the path is a directory, it is assumed to
  be a class folder, and its contents will be archived in a JAR, and the JAR will be copied to
  {@code WEB-INF/lib}. The JAR name follows Maven conventions and is determined from properties
  defined in any file named {@code pom.properties}, located in any subdirectory of
  {@code META-INF/maven}, if available (otherwise, a random JAR name is generated).
  <p>
  If the path is not a directory, it is assumed to be a JAR, and its contents will be copied to
  {@code WEB-INF/lib}.
  
  @param libraryPath
  path to library
  @return {@code this} for fluent syntax