simple vtk extension readme

extensions/ohif-vtk-extension/.prettierrc

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extensions/ohif-vtk-extension/README.md

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 # @ohif/extension-vtk
+
+![npm (scoped)](https://img.shields.io/npm/v/@ohif/extension-vtk.svg?style=flat-square)
+
+<!-- TODO: Simple image or GIF? -->
+
+#### Index
+
+Extension Id: `vtk`
+
+- [Commands Module](#commands-module)
+- [Toolbar Module](#toolbar-module)
+- [Viewport Module](#viewport-module)
+
+## Commands Module
+
+| Command Name           | Description | Store Contexts |
+| ---------------------- | ----------- | -------------- |
+| `axial`                |             | viewports      |
+| `coronal`              |             | viewports      |
+| `sagittal`             |             | viewports      |
+| `enableRotateTool`     |             | viewports      |
+| `enableCrosshairsTool` |             | viewports      |
+| `enableLevelTool`      |             | viewports      |
+| `mpr2d`                |             | viewports      |
+
+## Toolbar Module
+
+Our toolbar module contains definitions for:
+
+- `Crosshairs`
+- `WWWC`
+- `Rotate`
+
+All use the `ACTIVE_VIEWPORT::VTK` context.
+
+## Viewport Module
+
+Our Viewport wraps [OHIF/react-vtkjs-viewport][react-viewport] and is connected
+the redux store. This module is the most prone to change as we hammer out our
+Viewport interface.
+
+## Resources
+
+### Repositories
+
+- [OHIF/react-vtkjs-viewport][react-viewport]
+
+<!--
+  Links
+  -->
+
+<!-- prettier-ignore-start -->
+[react-viewport]: https://github.com/OHIF/react-vtkjs-viewport
+<!-- prettier-ignore-end -->