feat(plugins): inject API on window.__TAURI__ (#383)

shared/template/src/lib.rs

@@ -39,6 +39,7 @@ impl<R: Runtime, T: Manager<R>> crate::{{ plugin_name_pascal_case }}Ext<R> for T
 /// Initializes the plugin.
 pub fn init<R: Runtime>() -> TauriPlugin<R> {
   Builder::new("{{ plugin_name }}")
+    .js_init_script(include_str!("api-iife.js").to_string())
     .invoke_handler(tauri::generate_handler![commands::execute])
     .setup(|app, api| {
       #[cfg(mobile)]