adds draft for new release announcement

outreach/v0.20_announcement_and_call_for_userstories.md

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+<!---
+ When 0.20.0 is released this announcement will be posted to r/rust and the
+ rust user forum. Also post in rust audio discord: https://discord.gg/8qW6q2k
+-->
+
+# Announcing rodio 0.20 and call for help
+
+
+Rodio is an audio playback library. It can decode audio files, synthesize new
+sounds, apply effects to sounds & mix them. Rodio has been part of the Rust
+ecosystem for 9 years now! 🎉.
+
+## New release
+The rodio contributors have made many improvements in the last 5 months. Rodio can now:
+
+- Seek back and forth through sound efficiently
+- Track the playback position at sample accuracy!
+- Generate more signals such as chirps, white & pink noise and different
+  wavesforms
+- Automatically adjust the gain to limit the peak volume and change in loudness
+
+This is ignoring the many fixes and smaller additions made by the many
+contributors who helped out expand rodio.
+
+## Call for help
+
+In its 9 years of existence Rust has changed a lot. Further more Rodio is being
+used for applications beyond its original scope. To improve rodio we believe its
+time for larger (breaking) changes. 
+
+### User feedback
+To ensure we make the right changes we want
+to know what rodio is being used for and what you all would like to use it for. 
+
+We can use any input you have but are especially looking for users who are:
+- using rodio and feel some part of the API is hard to use.
+- have experienced footguns/pain point
+- wanted to use rodio but could not make it fit their use-case (excluding complex
+  game audio (best served by [kira](https://crates.io/crates/kira)) and advanced
+  dsp). If you disagree and think rodio can server those excluded use-case too
+  let us know!
+
+The best way to leave your feedback is a short user story on our issue
+[tracker](https://github.com/RustAudio/rodio/issues). If that is not your thing
+any other form posted there works too!
+
+### Architecture & API
+We can use input on our planned [changes](https://github.com/RustAudio/rodio/issues/614) and how to best implement them.