update AMP doc

repository/amps/README.md

@@ -16,3 +16,15 @@ way to build well structured AMPs.
 > use the [out-of-process Alfresco
 > SDK](https://docs.alfresco.com/content-services/latest/develop/oop-sdk/) to
 > build Docker images with your extensions.
+
+By default the `scripts/fetch-amps.sh` script will fetch the following AMPs from the Alfresco Nexus repository:
+
+* alfresco-share-services
+* alfresco-aos-module
+* alfresco-device-sync-repo
+* alfresco-googledrive-repo-enterprise
+* alfresco-content-services-distribution
+
+You can replace those, remove them to keep only the ones you need or add more.
+Be careful though as some AMPs may depend on one another (e.g.
+`googldrive-repo` depends on `alfresco-share-services`).