rateLimiter for 50 request per second withing the api and time ordered messages arrival

old setInterval is no good!

add a basicUsageExmaple for the new api implementation.
much more simple and readable code now

all request pass the do action method that uses the rateLimiter in order that request rate would be handled correctly

consumeMessages only after last consuming ended at client side
 in that way we're controlling the messages in a real timeline like way

added order and contract on OpenOrder() message
added limitPrice from the order. later on I'll add all other necessary info
Please use two spaces for tabspace in JS.