Update README.md

README.md

@@ -153,6 +153,15 @@ Some extensions require [jQuery](http://jquery.com) and [jQuery UI](http://jquer
 
 For building, we need [Node](http://nodejs.org) and [npm](http://npmjs.org).  Running 'make' should get you going with any luck.
 
+## Contributing
+
+Pull requests are always welcome!  Please follow a few guidelines:
+
+- Please don't include updated versions of `rickshaw.js` and `rickshaw.min.js`.  Just changes to the source files will suffice.
+- Add a unit test or two to cover the proposed changes
+- Do as the Romans do and stick with existing whitespace and formatting conventions (i.e., tabs instead of spaces, etc)
+- Consider adding a simple example under `examples/` that demonstrates any new functionality
+
 ## Authors
 
 This library was developed by David Chester, Douglas Hunter, and Silas Sewell at [Shutterstock](http://www.shutterstock.com)