Add dhall-rook (#66)

Author: kukimik

README.md

@@ -78,6 +78,7 @@ A curated list of awesome dhall-lang binding, libraries and anything related to
 - [dhall-semaphore](https://github.com/maxdeviant/dhall-semaphore) - Dhall bindings for Semaphore CI.
 - [dhall-spinnaker](https://github.com/zendesk/dhall-spinnaker) - Dhall bindings to the Spinnaker Pipeline API.
 - [dhall-sgf](https://github.com/TristanCacqueray/dhall-sgf) - Dhall support for the Smart Game Format.
+- [dhall-rook](https://github.com/jbellerb/dhall-rook) - Dhall bindings for [Rook](https://rook.io/).
 
 ## Projects
 - [cpkg](https://github.com/vmchale/cpkg) - A build tool/package manager for C, configured with Dhall.