code: @Override
      public final T addAsManifestResource(String resourceName) {
          Validate.notNull(resourceName, "ResourceName should be specified");
          return addAsManifestResource(fileFromResource(resourceName), resourceName);
      }
docs: {@inheritDoc}
  
  @see org.jboss.shrinkwrap.api.container.ManifestContainer#addAsManifestResource(java.lang.String)