WEB_NOTES update

WEB_NOTES.md

@@ -45,7 +45,11 @@ Here a sketch to show the step used:
 **#1.** This function is called while initializing the player with `FlutterSoLoudWeb.setDartEventCallbacks()`.
 It creates a Web Worker in the [WASM Module](https://emscripten.org/docs/api_reference/module.html) using the compiled `web/worker.dart`. After calling this, the WASM Module will have a new variable called `Module.wasmWorker` which will be used in Dart to receive messages.
 By doing this it will be easy to use the Worker to send messages from within the CPP code.
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 **#2.** This function, like #1, uses [EM_ASM](https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html#interacting-with-code-call-javascript-from-native) to inline JS. This JS code uses the `Module.wasmWorker` created in #1 to send a message.
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 **#3.** This is the JS used and created in #1. Every messages sent by #2 are managed here and sent to #4.
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 **#4.** Here when the event message has been received, a new event is added to a Stream. This Stream is listened by the SoLoud API.
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 **#5.** Here we listen to the event messages coming from the `WorkerController` stream. Currently, only the "voice ended" event is supported. The Stream is listened in `SoLoud._initializeNativeCallbacks()`.