Add readme

Author: gridbugs

audio-file/README.md

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+![CAW Logo](../assets/logo.png)
+
+# caw_audio_file
+
+[![Version](https://img.shields.io/crates/v/caw_audio_file.svg)](https://crates.io/crates/caw_audio_file)
+[![Documentation](https://docs.rs/caw_audio_file/badge.svg)](https://docs.rs/caw_audio_file)
+[![test](https://github.com/gridbugs/caw/actions/workflows/test.yml/badge.svg)](https://github.com/gridbugs/caw/actions/workflows/test.yml)
+[![dependency status](https://deps.rs/repo/github/gridbugs/caw/status.svg)](https://deps.rs/repo/github/gridbugs/caw)
+
+Load audio files for sampling in the caw synthesizer framework.
+
+Part of the [CAW Synthesizer Framework](..).