README added for levels example

examples/levels/README.md

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+## About
+
+Prints PREFADER level values for audio device `Desktop Audio`. If mute toggled prints mute state changed notification.
+
+## Use
+
+This example assumes the existence of a `config.toml`, placed next to `__main__.py`:
+
+```toml
+[connection]
+host = "localhost"
+port = 4455
+password = "mystrongpass"
+```
+
+Press `<Enter>` to exit from the script.