Specific install instructions (#215)

Author: mr-c

setup.md

@@ -4,7 +4,7 @@ title: Setup
 To follow the Common Workflow Language user guide, you will need an up-to-date
 Linux or Mac OS X system, with the following software installed:
 
-- A text editor with YAML support
+- A text editor with YAML support, for example [Visual Studio Code with the Benten (CWL) plugin](https://github.com/rabix/benten#install-vs-code-extension). If you want to use a different text editor then review [this list of plugins that add CWL support to code editors](https://www.commonwl.org/#Editors_and_viewers)
 - A CWL implementation to run the described tools and workflows. When first
 getting started with CWL, we recommend the reference implementation,
 [`cwltool`][ref-imp]. You can find a full list on