to launch from the source code you need to setup SFML first
but you can always try it by launching the executable file in "bin/Debug"
start an instance of the application in a device and another one in another device
keep the two of them connected to the same wifi
choose "s" for the server in one of the two devices and "c" for the client in the other one
copy the ip address from the server to the client
start chatting :)
if you wanna end it just write "exit" (you can now discover that it's impossible to send such message to your friend XD )