message: Mention Node.js support of TensorFlow.js in index.md
diff: @@ -17,7 +17,8 @@ TensorFlow:
  Python is currently the only language supported by TensorFlow's API stability
  promises. However, TensorFlow also provides functionality in C++, Go, Java and
  -[JavaScript](https://js.tensorflow.org),
  +[JavaScript](https://js.tensorflow.org) (incuding
  +[Node.js](https://github.com/tensorflow/tfjs-node)),
  plus community support for [Haskell](https://github.com/tensorflow/haskell) and
  [Rust](https://github.com/tensorflow/rust). If you'd like to create or
  develop TensorFlow features in a language other than these languages, read the
  