code: public MultipartBuilder inline(InputStream is, String cidName) {
          return bodyPart(new StreamDataBodyPart("inline", is, cidName));
      }
docs: Adds a named inline attachment.
  
  @param is      an stream to read the attachment
  @param cidName the name to give to the attachment as referenced by the HTML email body
  i.e. use cidName sample-image.png for the below example
  <p>
  <img src="cid:sample-image.png" alt="sample">
  </p>
  @return this builder