Add bithub badge to readme

README.md

@@ -27,6 +27,11 @@ Please see
 for setup instructions and contributor guidelines. And don't forget to sign the
 [CLA](https://whispersystems.org/cla/).
 
+This repository is set up with [BitHub](https://whispersystems.org/blog/bithub/), so you can make money for committing to Signal. The current BitHub price for an accepted pull request is:
+
+[![Current BitHub Price](https://bithub.herokuapp.com/v1/status/payment/commit/)](https://whispersystems.org/blog/bithub/)
+
+
 ## Contributing Ideas
 Have something you want to say about Open Whisper Systems projects or want to be part of the conversation? Get involved in the [community forum](https://whispersystems.discoursehosting.net)!