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README.md: add some libraries info (#631) 

Add some information of libraries depended by GD. Add a note to GD user about the license of libimagequant.
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wilson chen 2020-04-30 00:00:49 +08:00 committed by GitHub
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@ -45,3 +45,12 @@ It also has optional support for more formats via external libraries:
* [TIFF](https://en.wikipedia.org/wiki/Tagged_Image_File_Format) via [libtiff](http://www.libtiff.org/)
* [WebP](https://en.wikipedia.org/wiki/WebP) via [libwebp](https://developers.google.com/speed/webp/)
* [XPM](https://en.wikipedia.org/wiki/X_PixMap) via [libXpm](http://xorg.freedesktop.org/)
Besides that, GD depends on some external libraries, which are all optional
and disabled by default:
* [FreeType](https://freetype.org) for rendering fonts
* [Fontconfig](https://fontconfig.org) for configuring and customizing font access
* [libraqm](https://github.com/HOST-Oman/libraqm) for complex text layout
* [libimagequant](https://pngquant.org/lib) for conversion of RGBA images to 8-bit indexed-color images
* **NOTE** libimagequant is dual-licensed: GPLv3 and commercial license