add link to contributor's guide

chriddyp · chriddyp · commit 1d75115f7190 · 2015-02-16T11:06:20.000-05:00
diff --git a/README.md b/README.md
@@ -40,6 +40,9 @@ Stay in touch
 - <feedback@plot.ly>
 - [@plotlygraphs](https://twitter.com/plotlygraphs)
 
+Contributing
+---
+- Contributions welcome! Check out our [wiki](https://github.com/ropensci/plotly/wiki/Development-guidelines) for more information. 
 
 ---
 
