Goroutine to support multiple markets

[ianeinser]

Hi @sudhanshu-pantelwar ,

first of all, i would like to thank you for this wonderful library. I have a question regarding modification to support multiple markets.

Can you point where i should start to call go func() {}() ? I suppose I should embed here but got no clue how to do so. Can you help?

`var pairBook *engine.OrderBook
if val, ok := e.book[req.GetPair()]; ok {
pairBook = val
} else {
pairBook = engine.NewOrderBook()
e.book[req.GetPair()] = pairBook
}

ordersProcessed, partialOrder := pairBook.Process(order)

ordersProcessedString, err := json.Marshal(ordersProcessed)`

regards

[github-actions]

Message that will be displayed on users' first issue