added nestedNavigator branch demo

Author: shubhnik

nestedNavigators.gif

@@ -1,15 +1,24 @@
 # React-Navigation + Redux
 
- * Accompanying blog :
- https://hackernoon.com/a-comprehensive-guide-for-integrating-react-navigation-with-redux-including-authentication-flow-cb7b90611adf
+* Accompanying blog :
+  https://hackernoon.com/a-comprehensive-guide-for-integrating-react-navigation-with-redux-including-authentication-flow-cb7b90611adf
 
- * **[Master Branch](https://github.com/shubhnik/redux-react-navigation)**: React-Navigation + Redux integration
+* **[Master Branch](https://github.com/shubhnik/redux-react-navigation)**:
+  React-Navigation + Redux integration
 
- * **[authFlow branch](https://github.com/shubhnik/redux-react-navigation/tree/authFlow)**: React-Navigation + Redux + Redux-Persist with authentication flow
+* **[authFlow branch](https://github.com/shubhnik/redux-react-navigation/tree/authFlow)**:
+  React-Navigation + Redux + Redux-Persist with authentication flow
 
- * **[nestedTab branch](https://github.com/shubhnik/redux-react-navigation/tree/nestedTab)**:
- Includes nested navigators
- 
- --> Final result with authentication flow(authFlow branch of this repo)
+* **[nestedTab branch](https://github.com/shubhnik/redux-react-navigation/tree/nestedTab)**:
+  Includes nested tabs
 
-![demo](./authFlow.gif)
+* **[nestedNavigators branch](https://github.com/shubhnik/redux-react-navigation/tree/nestedNavigators)**:
+  Includes nested navigators, more real world scenario
+
+#### Result of authFlow branch
+
+![authFlow demo](./authFlow.gif)
+
+#### Result of nestedNavigators branch
+
+![nestedNavigator demo](./nestedNavigators.gif)