Adding the docs for websockets

[abhi18av]

I noticed that the logo on the README isn't being rendered completely and then I realized that the reason is that it points to a non-existent docs folder in the repo.

I checked further in the fulcro-legacy org but there I could only find the examples. I guess, this could be added in the list of ToDo we have. Using this issue as a reminder for that, please feel free to close it in case there's already some work done in this direction.