add readme

packages/webaudio/README.md

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+# @strudel.cycles/xen
+
+This package adds xenharmonic / microtonal functions to strudel Patterns.
+
+## Install
+
+```sh
+npm i @strudel.cycles/webaudio --save
+```
+
+## Example
+
+```js
+import { Scheduler, getAudioContext } from '@strudel.cycles/webaudio';
+
+const scheduler = new Scheduler({
+    audioContext: getAudioContext(),
+    interval: 0.1,
+    onEvent: (e) => e.context?.createAudioNode?.(e),
+  });
+const pattern = sequence([55, 99], 110).osc('sawtooth').out()
+scheduler.setPattern(pattern);
+scheduler.start()
+//scheduler.stop()
+```