Update README.md

README.md

@@ -4,6 +4,9 @@ Hoplite is a system for storing large volumes of embeddings from machine
 perception models. We focus on combining vector search with active learning
 workflows, aka [agile modeling](https://arxiv.org/abs/2302.12948).
 
+While we get this documentation ready, we recommend checking out the main 
+[Perch repository](https://github.com/google-research/perch).
+
 # Disclaimer
 
 This is not an officially supported Google product. This project is not