feat: mpris support for audio applet

cosmic-applet-audio/src/config.rs

@@ -0,0 +1,15 @@
+use cosmic::cosmic_config::cosmic_config_derive::CosmicConfigEntry;
+use cosmic::cosmic_config::{self, Config, ConfigGet, ConfigSet, CosmicConfigEntry};
+use serde::{Deserialize, Serialize};
+
+#[derive(Default, Debug, Clone, Serialize, Deserialize, CosmicConfigEntry, PartialEq, Eq)]
+pub struct AudioAppletConfig {
+    pub show_media_controls_in_top_panel: bool,
+}
+
+impl AudioAppletConfig {
+    /// Returns the version of the config
+    pub fn version() -> u64 {
+        1
+    }
+}