update readme docs with images and summary

Author: ShMcK

README.md

@@ -2,6 +2,10 @@
 
 CodeRoad is a VSCode extension that allows you to play interactive coding tutorials in your editor.
 
+![CodeRoad Image](./docs/images/tutorial-example.png)
+
+Build and share your own interactive tutorials. Learn more about [how tutorials area created](./docs/tutorials.md).
+
 ## Getting Started
 
 ### Launch
@@ -20,8 +24,9 @@ To start the extension, inside VSCode:
   [Download Visual Studio Code - Mac, Linux, Windows](https://code.visualstudio.com/download)
 - VSCode command line tools.
   For Mac, installation requires an additioanl step. See [Running Visual Studio Code on macOS](https://code.visualstudio.com/docs/setup/mac#_launching-from-the-command-line).
+- Node.js 10+
+  [Download Node.js](https://nodejs.org/en/download/)
 - Git
-- Node 10+
 
 ### Installation
 
@@ -32,3 +37,7 @@ To install the extension manually:
 - run `vsce package` to build the package.
   Learn more about [VSCE](https://code.visualstudio.com/api/working-with-extensions/publishing-extension)
 - run `code —install-extension coderoad-0.1.0.vsix`.
+
+## License
+
+[AGPL v3](https://github.com/coderoad/coderoad-vscode/blob/master/LICENSE.md)