Broadcast with coding example

Hi @mortenvp ,

Here is the broadcast with coding example. Basically, it's a sender of UDP packets to 2 receivers. I think later will be nice to create a function for receivers' UDP sockets. I reused the `KodoSimulation` class from the previous example. Also I would like to make some more tests, but you or anyone else can check it out to tell me what could we add.
Cool. Will look at it.