AppEvent (#61)

Extend `events` to provide a `mpsc` channel to send `AppEvent`'s from
anywhere in the app straight to the `App`.

src/sound.rs

@@ -0,0 +1,29 @@
+use rodio::{Decoder, OutputStream, Sink};
+use std::fs;
+
+pub struct Sound {
+    sound_data: Vec<u8>,
+}
+
+impl Sound {
+    pub fn new(path: &str) -> Result<Self, String> {
+        let sound_data = fs::read(path).map_err(|e| format!("Failed to read sound file: {}", e))?;
+        Ok(Self { sound_data })
+    }
+
+    pub fn play(&self) -> Result<(), String> {
+        let (_stream, stream_handle) = OutputStream::try_default()
+            .map_err(|e| format!("Failed to get audio output: {}", e))?;
+
+        let sink = Sink::try_new(&stream_handle)
+            .map_err(|e| format!("Failed to create audio sink: {}", e))?;
+
+        let cursor = std::io::Cursor::new(self.sound_data.clone());
+        let source = Decoder::new(cursor).map_err(|e| format!("Failed to decode audio: {}", e))?;
+
+        sink.append(source);
+        sink.sleep_until_end();
+
+        Ok(())
+    }
+}