title: Add image into a word .docx document header using POI XWPF
body: <p>I've been trying to add .png image to .docx file header with Apache POI. I did´t find a method that help me. someone know how do it?
  Whith this code I could add only text.  </p>
  
  <pre><code>XWPFDocument docc = new XWPFDocument(); 
  CTP ctpHeader = CTP.Factory.newInstance(); 
  CTR ctrHeader = ctpHeader.addNewR(); 
  CTText ctHeader = ctrHeader.addNewT(); 
  String headerText = "mi encabezado"; 
  ctHeader.setStringValue(headerText); 
  
  XWPFParagraph headerParagraph = new XWPFParagraph(ctpHeader, docc); XWPFParagraph[] parsHeader = new XWPFParagraph[1]; 
  parsHeader[0] = headerParagraph; header.createHeader(XWPFHeaderFooterPolicy.DEFAULT, parsHeader);
  </code></pre>