The devs on Github for steemit.com have been responsive & excellent. I've made some pull requests to fix the README there, but that's really the only piece of documentation. The protocol / steemd API is way more complicated, would be great to see readme or similar implemented. I'm not a very good Dev, but I can write docs & examples, and I bet there are more people like me that would contribute.
RE: [Steemit Hunt] Readme - Developer documentation made easy