Use WebSocket to make a realtime connection 

# Current 
The api dataset changes ar every 60sec. 
To get the latest data I have stated a infinity loop where delaying to make network call at every 60sec. 
Ref [Click here](https://github.com/Chandra-Sekhar-Bala/CryptoApp/blob/master/app/src/main/java/com/cryptoapp/demo/ui/exchangeFrag/ExchangeViewModel.kt)
# Expected 
Make the network call using Websocket to make less network call. 
