Easier to understand lede (#981)

_lede_ is a [word](https://www.merriam-webster.com/dictionary/lede), not a spelling mistake. In case you were wondering.

README.md

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-App-wide support for 100% native navigation with an easy cross-platform interface. For iOS, this package is a wrapper around [react-native-controllers](https://github.com/wix/react-native-controllers), but provides a simplified more abstract API over it. It also fully supports redux if you use it.
+### tldr;
+
+React Native Navigation provides 100% native platform navigation on both iOS and Android for React Native apps. The JavaScript API is simple and cross-platform - just install it in your app and give your users the native feel they deserve. Using redux? No problem: React Native Navigation comes with optional redux support out of the box. Ready to get started? Check out the [docs](https://wix.github.io/react-native-navigation/).
 
 <img src="https://github.com/wix/react-native/blob/master/src/videos/demo.gif?raw=true" width="240">