Merge pull request #1 from RustAudio/demo

draft text for demo, please comment

Author: dvdsk

demo.md

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+Currently Rodio is by far the most widely used audio engine. Unfortunately it
+seems limited by what we knew 9 years ago about audio development in Rust. Since
+then new crates have been build to overcome that. We hope to demonstrate one
+crate to be best suited to all use cases and then build support behind it. For
+that we are building a demo. It will take the form of a game environment since
+game audio is seen as the most challenging use case. The goal is to have users 
+feel how the game responds differently when switching audio engine.
+
+Currently two crates are participating in this demo: `Rodio` and `Firewheel`
+though everyone is very welcome. The demo will be limited to functionality that
+is properly implemented by all crates.
+
+# Demo 
+- audio environment playing back many sounds at the same time.
+- sounds and effects are influenced by user input to make it easy to judge
+  latency.
+- the demo uses audio libraries in the same way as a game.
+- pre-defined events instead of user input to keep the demo repeatable.
+- no graphics to keep the demo code simple.
+- sounds are all at the same sample-rate.
+- implementations pre-resample before loading.