Create NodeJS client API

[perone]

Create the NodeJS client API package.

[mycaule]

I think the use case of a Node.js client calling EuclidesDB is not so relevant now in beginning of 2020.

In fact from this Tensorflow.js @tensorflow-models/mobilenet model, it is now pretty straightforward to get embeddings, and some developer would rather write their embeddings server directly in Node.js using a LevelDB client and use Tensorflow instead of PyTorch.

What do you think?