title: Add a PDFPTable to bottom of page in iText
body: <p>I'm trying to add a table as a footer containing all the copyright text, page number etc. But I can't find any supporting method that'll accept a <code>PdfPTable</code></p>
  
  <p>For a phrase there is code like:</p>
  
  <pre><code>ColumnText.showTextAligned(writer.getDirectContent(),
          Element.ALIGN_CENTER, new Phrase(
              String.format("%d", document.getPageNumber())),
              (document.getPageSize().getLeft() + document.getPageSize().getRight())/2,
              document.getPageSize().getBottom() + 18, 0);
  </code></pre>