chore(store): add AppSettings example (#573)

* basic example foundation

* add examples to workspace

* cleanup and load fix

* fmt

* reset lockfile

---------

Co-authored-by: FabianLars <fabianlars@fabianlars.de>

plugins/store/examples/AppSettingsManager/src-tauri/src/app/mod.rs

@@ -0,0 +1 @@
+pub mod settings;

plugins/store/examples/AppSettingsManager/src-tauri/src/app/settings.rs

@@ -0,0 +1,29 @@
+use tauri_plugin_store::Store;
+
+#[derive(Debug, Clone)]
+pub struct AppSettings {
+    pub launch_at_login: bool,
+    pub theme: String,
+}
+
+impl AppSettings {
+    pub fn load_from_store<R: tauri::Runtime>(
+        store: &Store<R>,
+    ) -> Result<Self, Box<dyn std::error::Error>> {
+        let launch_at_login = store
+            .get("appSettings.launchAtLogin")
+            .and_then(|v| v.as_bool())
+            .unwrap_or(false);
+
+        let theme = store
+            .get("appSettings.theme")
+            .and_then(|v| v.as_str())
+            .map(|s| s.to_string())
+            .unwrap_or_else(|| "dark".to_string());
+
+        Ok(AppSettings {
+            launch_at_login,
+            theme,
+        })
+    }
+}