Add Scaleway to ADOPTERS.md

ADOPTERS.md

@@ -9,6 +9,10 @@ production users that have added themselves (in alphabetical order):
     API of [Chef Automate](https://automate.chef.io/). Furthermore, the generated
     OpenAPI data serves as the basis for its [API documentation](https://automate.chef.io/docs/api/).
     The code is Open Source, [see `github.com/chef/automate`](https://github.com/chef/automate).
+* [Scaleway](https://www.scaleway.com/en/) uses the gRPC-Gateway since 2018 to
+    serve millions of API requests per day [1].
 
 If you have adopted the gRPC-Gateway and would like to be included in this list,
 feel free to submit a PR.
+
+[1]: [The odyssey of an HTTP request in Scaleway](https://www.youtube.com/watch?v=eLxD-zIUraE&feature=youtu.be&t=480).