moar contribute

README.markdown

@@ -118,6 +118,15 @@ long as you don't have butter fingers.
 Soon enough, though, this'll be stable to the point where I can truthfully tell
 myself that this time baby, `boom` will be, bulletttttttttttttproof ♫.
 
+## Contribute
+
+I'd love to include your contributions, friend. Make sure your methods are
+[TomDoc](http://tomdoc.org)'d properly, that existing tests pass (`rake`), and
+that any new functionality includes appropriate tests. Bonus points if you're
+not updating the gemspec or bumping boom's version.
+
+All good? Cool! Then [send me a pull request](https://github.com/holman/boom/pull/new/master)!
+
 ## I love you
 
 [Zach Holman](http://zachholman.com) made this. Ping me on Twitter —