docs: link to off-query docs in README

README.md

@@ -54,6 +54,7 @@ The infrastructure documentation is as follows:
 The main services:
 - [MongoDB](./docs/mongodb.md) the MongoDB database
 - [Redis](./docs/redis.md) we also use Redis
+- [Open Food Facts Query](./docs/openfoodfacts-query.md) service computing aggregations
 
 Some services: