Updated README

Author: GregorR

README

@@ -1,4 +1,4 @@
-RNNoise is a noise suppression library based on a recurrent neural network
+RNNoise is a noise suppression library based on a recurrent neural network.
 
 To compile, just type:
 % ./autogen.sh
@@ -12,6 +12,9 @@ While it is meant to be used as a library, a simple command-line tool is
 provided as an example. It operates on RAW 16-bit (machine endian) mono
 PCM files sampled at 48 kHz. It can be used as:
 
-./examples/rnnoise_demo input.pcm output.pcm
+./examples/rnnoise_demo <number of channels> <maximum attenuation> [model to use] < input.raw > output.raw
 
 The output is also a 16-bit raw PCM file.
+
+For information on the neural network models available, see
+https://github.com/GregorR/rnnoise-models