feature: implementation of weighted round robin algorithm

[nikhil-chourasia]

there can be multiple servers connected to a load balancer but it is not necessary that there capacity to handle requests would be the same hence to tackle that we can implement weighted round robin algorithm in which the admin can assign certain weights to certain servers and the server with more weight gets more requests and the ones with lesser weight will get lesser requests

point to be noted the requests would still be distributed in round robin format moving from one to another then to another since this algorithm is an extension of round robin