Update README.zh.md

Author: crazycodeboy

README.zh.md

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 # react-native-splash-screen
 
-**[English](https://github.com/crazycodeboy/react-native-splash-screen)**
+**[English](https://github.com/crazycodeboy/react-native-splash-screen) | [原理解析](https://github.com/crazycodeboy/RNStudyNotes/blob/master/React%20Native%20%E9%97%AE%E9%A2%98%E5%8F%8A%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%E5%90%88%E9%9B%86/React%20Native%20%E5%90%AF%E5%8A%A8%E7%99%BD%E5%B1%8F%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3%E6%95%99%E7%A8%8B/React%20Native%20%E5%90%AF%E5%8A%A8%E7%99%BD%E5%B1%8F%E9%97%AE%E9%A2%98%E8%A7%A3%E5%86%B3%E6%95%99%E7%A8%8B.md)**
 
 React Native启动屏，解决iOS，Android启动白屏问题，支持Android和iOS。