fix: quit application via window close icon

This commit closes #33

main.ts

@@ -52,6 +52,10 @@ function createWindow(): BrowserWindow {
         // in an array if your app supports multi windows, this is the time
         // when you should delete the corresponding element.
         win = null;
+
+        if (process.platform !== 'darwin') {
+            app.quit();
+        }
     });
 
     return win;