Update root README.md

Author: octogonz

README.md

@@ -72,6 +72,7 @@ NOTE: The **@microsoft/tsdoc** library is intended to be incorporated into other
 - Check out the [TSDoc Playground](https://microsoft.github.io/tsdoc/) for a cool interactive demo of TSDoc!  :-)
 - The library [@microsoft/tsdoc](https://www.npmjs.com/package/@microsoft/tsdoc) provides a TSDoc parser that you can use in your own projects.  The source code for this library can be found in the [/tsdoc](./tsdoc/) folder.
 - The [/api-demo](./api-demo/) folder has a small demo project illustrating how to invoke the **@microsoft/tsdoc** library.
+- We also provide an ESLint plugin [eslint-plugin-tsdoc](https://www.npmjs.com/package/eslint-plugin-tsdoc) that you can use to validate your source code.
 - See [Contributing.md](./Contributing.md) for instructions for building, debugging, and contributing to TSDoc.
 - We're using [GitHub issues](https://github.com/Microsoft/tsdoc/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc) to discuss the TSDoc specification, library design, and project roadmap.