add link to repo for custom load & SAE classes

README.md

@@ -10,7 +10,7 @@ examples for each feature.
 
 ## Model Information
 
-This release contains two SAEs, one for general reasoning and one for math. Load them
+This release contains two SAEs, one for general reasoning and one for math. After cloning our [demo repo](https://github.com/goodfire-ai/r1-interpretability/tree/main), you can load them
 with the following snippet:
 
 ```python