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simek
2b56011f9c
Summary: This PR adds support for the dark mode and dynamic theme changing to the default App template and to the related `NewAppScreen` components. Using `useColorScheme` hook forced me to refactor a bit main `App.js` file, but I think those changes are step in the right direction according to way in which React Native is used in larger apps, so new `Section` component has been extracted to reduce code redundancy/repetition inside `App`. Additional color `darker` has been added to the `Colors` statics from `NewAppScreen` because `dark` was too bright for the Dark Mode backgrounds. Also main `StoryBoard` on iOS has been updated to use theme based colors instead of static or hardcoded ones. There was also an unused, empty `Label` which I have removed. ~~I'm not so much experienced with Android. If someone could also update Android splash screen (if Android requires such change) it will be nice. I want to look at this later using simulator.~~ > I have updated the Android splash screen and tested this change on the Android emulator. If you have any comment or corrections feel free to post them out, I would like to put more work into this PR if it's needed. Dark Mode this days is a part of near every OS, so it could be considered as a standard feature. I hope those changes helps people which struggle with the basic theming implementation (+ there is now an example of hook and `children` prop usage in the template). ## Changelog [Internal] [Added] - Add dark mode support to the default app template Pull Request resolved: https://github.com/facebook/react-native/pull/28711 Test Plan: I have tested the App from the template on the iOS device and in Android emulator with RN `0.63.0-rc`. Screen recording on iOS (demonstarates both modes, both splash screens and transition):  Screenshot of iOS app in Dark Mode:  Screenshot of iOS app splash screen in Dark Mode:  Screenshot of Android app in the emulator:  Differential Revision: D21236148 Pulled By: shergin fbshipit-source-id: 0c8a9534d3a3f8f8099af939243a889ac4df6cda
