Add QOI (image format library) (fffaraz#1573)

Author: toge

README.md

@@ -659,6 +659,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [OpenEXR](http://www.openexr.com/) - Cross-platform library for high dynamic range imaging. [Modified BSDF]
 * [OpenImageIO](https://github.com/OpenImageIO/oiio) - Powerful image and texture wrangling library with support for a wide number of common lossy and RAW formats. [Modified BSD]
 * [OpenJPEG](https://github.com/uclouvain/openjpeg) - an open-source JPEG 2000 codec written in C language.  [BSD-2-Clause]
+* [QOI](https://github.com/phoboslab/qoi) - The “Quite OK Image Format” for fast, lossless image compression. [MIT]
 * [SAIL](https://github.com/happy-sea-fox/sail) - Easy-to-use cross-platform image decoding library with pluggable image codecs. [MIT]
 * [Simd](https://github.com/ermig1979/Simd) - C++ image processing library with using of SIMD: SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, AVX2, AVX-512, VMX(Altivec) and VSX(Power7), NEON for ARM. [MIT]
 * [stb-image](https://github.com/nothings/stb/blob/master/stb_image.h) - STB single-header image loading library. [Public Domain]