add subscribe to docs

[reizhafajrian]

i think your web socket pretty good but please add more docs for how to use it

[endenwer]

Thanks. I documented the only function I have getCandles. If you want to use connection directly, you can look at the source code of this function. Right now I don't have enough time for this project.

[reizhafajrian]

okay can,i found the way to call WebSocket maybe I can write the docs for you

[endenwer]

It would be great, you can try.