Audio: Add rnnoise

Author: myd7349

README.md

@@ -165,6 +165,7 @@ A curated list of awesome C++ (or C) frameworks, libraries, resources, and shiny
 * [ni-media](https://github.com/NativeInstruments/ni-media) - C++ library for reading and writing audio files. [MIT]
 * [Opus](http://opus-codec.org/) - A totally open, royalty-free, highly versatile audio codec. [BSD]
 * [PortAudio](http://www.portaudio.com/) - PortAudio is a free, cross-platform, open-source, audio I/O library. [MIT]
+* [rnnoise](https://github.com/xiph/rnnoise) - Recurrent neural network for audio noise reduction. [BSD-3-Clause]
 * [SELA](https://github.com/sahaRatul/sela) - SimplE Lossless Audio. [MIT]
 * [SoLoud](https://github.com/jarikomppa/soloud) - Easy, portable audio engine for games. [zlib]
 * [Speex](http://www.speex.org/) - A free codec for free speech. Obsoleted by Opus. [BSD]