Merge pull request fffaraz#552 from kokuB/podofo

Added PoDoFo (LGPL)

Author: fffaraz

README.md

@@ -567,6 +567,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 
 * [libharu](https://github.com/libharu/libharu) - A free, cross platform, open-sourced software library for generating PDF. [zlib]
 * [MuPDF](https://mupdf.com/) - A lightweight PDF, XPS, and E-book viewer. [AGPL/Commercial]
+* [PoDoFo](http://podofo.sourceforge.net/) - A library to work with the PDF file format. [LGPL]
 * [Poppler](https://poppler.freedesktop.org/) - Open-source multi-backend PDF rendering library based on the xpdf-3.0 code base. [GPLv2/GPLv3]
 
 ## Physics