Merge pull request #419 from magento-devdocs/db_actiongroup_ref

Adding action group ref file.

Author: KevinBKozan

docs/actiongroup-list.md

@@ -0,0 +1,6 @@
+# MFTF action group reference
+
+Action groups are important building blocks for quickly creating tests for the Magento Functional Testing Framework.
+This page lists all current action groups so developers can see what is available to them.
+
+{% include mftf/actiongroup_data.md %}