Update qa/README.md re EE license

qa/README.md

@@ -67,6 +67,16 @@ bundle exec bin/qa Test::Instance::All http://localhost:3000
 Note: If you want to run tests requiring SSH against GDK, you
 will need to [modify your GDK setup](https://gitlab.com/gitlab-org/gitlab-qa/blob/master/docs/run_qa_against_gdk.md).
 
+#### Running EE tests
+
+When running EE tests you'll need to have a license available. GitLab engineers can [request a license](https://about.gitlab.com/handbook/developer-onboarding/#working-on-gitlab-ee).
+
+Once you have the license file you can export it as an environment variable and then the framework can use it. If you do so it will be installed automatically.
+
+```
+export EE_LICENSE=$(cat /path/to/gitlab_license)
+```
+
 ### Writing tests
 
 - [Writing tests from scratch tutorial](../doc/development/testing_guide/end_to_end/quick_start_guide.md)