Blurb regarding current state of tool management

2019-05-10 14:04:57 -04:00
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 # Tool Management
+
+This is not yet exposed in an easy/convenient way. Most tools are currently
+added by creating new Viewport, Toolbar, and SOPInstanceHandler extension
+modules. You can read more about that approach in [extensions](./extensions.md).
+
+In the near future, we intend to improve the extensibility of tools for existing
+Viewports (like our Cornerstone.js and VTK.js viewports).