Add editor Decorator sample to sample extension list

fixes #58

docs/tools/samples.md

@@ -21,6 +21,7 @@ Sample|Description|Type|InGallery
 ------|-----------|----|---------
 **[Word Count](https://github.com/Microsoft/vscode-wordcount)**|Adds a word count to the status bar for Markdown files that updates on editing events.  We have a [walkthrough on how this was created](/docs/extensions/example-word-count.md).|[Extension](/docs/extensions/example-hello-world.md)|Y
 **[MDTools](https://github.com/Microsoft/vscode-MDTools)**|Work with selections and update based on common text processing e.g. ToUpper, HTMLEncode, ...|[Extension](/docs/extensions/example-hello-world.md)|Y
+**[Decorator](https://github.com/Microsoft/vscode-extension-samples/tree/master/decorator-sample)**|Shows how to decorate editor text with a border, colors, and a custom cursor as well as add an overview ruler highlight.|[Extension](/docs/extensions/example-hello-world.md)|N
 **[TSLint](https://github.com/Microsoft/vscode-tslint)**|Lint your TypeScript files based on TSLint|[Language Server](/docs/extensions/example-language-server.md)|Y
 **[Spelling and Grammar Checker](https://github.com/Microsoft/vscode-spell-check)**|Configurable Markdown spelling and grammar checker.  Calls an external web service for checking and supports activation, add to dictionary, error mapping.  Watches for config file changes in real time.|[Extension](/docs/extensions/example-hello-world.md)|Y
 **[Mock Debugger](https://github.com/Microsoft/vscode-mock-debug)**|Helps you build and test a debugger.|[Debuggers](/docs/extensions/example-debuggers.md)|Y