Add 宋詞 tab to the 唐詩三百首 app

After I finished the 唐詩三百首 app, I tried to app 宋詞 to the app, to make user easier to find 宋詞, I uses tab view in the app, just drag another navigator controller for 宋詞, and drag a tab view controller to connect two navigators, then set the tabview as the initial scene, after all, we can have a typical iOS app that design with "table view" + "navigator view" + "tab view", is't very familiar UI for iOS users, and it's easy to use this app too!