Update README.md

add chart images to readme

Author: cldougl

README.md

@@ -8,6 +8,8 @@ plotly.js is a high-level, declarative charting library. plotly.js ships with ov
 chart types, including scientific charts, 3D graphs, statistical charts, SVG maps, financial charts,
 and more.
 
+![](https://raw.githubusercontent.com/cldougl/plot_images/add_r_img/plotly_2017.png)
+
 [Contact us](https://plot.ly/products/consulting-and-oem/) for Plotly.js consulting, dashboard development, application integration, and feature additions.
 
 ## Table of contents