Added new demo image to README (capitalone#37)

Added a series of demo screenshots to wiki and updated readme to point to img there

Author: marzolfb

README.md

@@ -14,6 +14,8 @@ Components include Pie charts, Bar charts, Smoothline charts, Stockline charts,
 
 This library is in its early stages, but I welcome contributors who would like to help make this the charting solution for React Native. Many of our mobile experiences need to create dashboards. Up to now, we've only been seeing libraries that are native bridges. Wouldn't it be great to have a cross platform solution that just worked?
 
+![](https://github.com/capitalone/react-native-pathjs-charts/wiki/images/chart-screenshots.png)
+
 ## Installation
 
 To add the library to your React Native project: