Adding a real README

README

-This project is highly experimental. Have fun, you're on your own for now.
+RNNoise is a noise suppression library based on a recurrent neural network
+
+To compile, just type:
+% ./configure
+% make
+
+Optionally:
+% make install
+
+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
+
+The output is also a 16-bit raw PCM file.