add VisualEditor/Parsoid info to readme

README.md

@@ -6,6 +6,9 @@ As of **9 August 2016** this version of GCL is live on the Monarch Pass server.
 ## Info about the test database
 The test database is a small collection of wiki pages, boards, and posts. There is an admin user (username `Abwayax`, password `testadmin`).
 
+## VisualEditor
+As of **15 June 2019** (MediaWiki 1.32) the VisualEditor extension is included. This requires a Parsoid service, which is *not* included. See the `docker-compose.yml` for details.
+
 ## Commands
 ### Build development environment
 `docker-compose build`