Websocket counter example

This example illustrates a way to keep and modify server-side state accesible through a websocket client, with query logging.

The code features the use of monad transformers and lenses.

To run the example, build or just run it with Stack and open 127.0.0.1:8080 in a web-browser.

$ stack repl

ghci starts up

*Main AppState Cmd Host> main

starts server and prints logs