add CircleCI badge, add link to Netflix

Author: raphamorim

README.md

@@ -2,13 +2,19 @@
 
 > Navigation for TVs using React-TV
 
+[![CircleCI](https://circleci.com/gh/react-tv/react-tv-navigation/tree/master.svg?style=svg)](https://circleci.com/gh/react-tv/react-tv-navigation/tree/master)
+
+tl;dr: [Based on Netflix TV Navigation System](https://medium.com/netflix-techblog/pass-the-remote-user-input-on-tv-devices-923f6920c9a8)
+
 ![React-TV Navigation Example](images/example.gif)
 
 [See code from this example](https://github.com/react-tv/react-tv/blob/master/examples/navigation/src/App.js)
 
-Based on Netflix navigation, React-TV-Navigation is a separated package from renderer to manage focusable components. React and [React-TV[(http://github.com/react-tv/react-tv)] are peer-dependencies.
+React-TV-Navigation is a separated package from renderer to manage focusable components. React and [React-TV](http://github.com/react-tv/react-tv) are peer-dependencies.
+
+## `withFocusable` and `withNavigation`
 
-## withFocusable and withNavigation:
+React-TV Navigation exports two functions: `withFocusable` and `withNavigation`.
 
 Navigation based on HOC and HOF beeing declarative.