title: Add Image in new page to existing PDF file
body: <p>I am new to itext in java. I have an existing pdf of 2 pages. I need to add 2 new pages to it and then add an image to the 3rd page and then add four small rectangles and some text in the 4th page. On searching I got codes for adding new pages and codes for adding images to the existing pdf separately. Column text was used to add text to a new page, I searched for adding image to column text but I cannot find it. <code>getUnderContent</code> helped me to add image at the bottom of 2nd page. I want the image to be added in 3rd page. And the 4th page gets more complicated. I add the rectangle and text using <code>PdfContentByte</code>. This should be done by creating a new page. Any ideas?</p>