add cross link to github

README.md

@@ -12,6 +12,8 @@ This dataset is a collection of RF samples and metadata in the [`zea` file forma
 
 This dataset is ready for commercial or non-commercial uses.
 
+Each subdirectory here holds a data card and a processing pipeline. The matching reconstruction scripts, one runnable reference reconstruction per subset, are in the companion repository, [github.com/open-h/OpenH-RF](https://github.com/open-h/OpenH-RF).
+
 ## Dataset Owner
 
 NVIDIA Corporation