Add new example: limit the quantity of printed messages

[end2endzone]

Create a new example to show that the class can be used to limit the number of printed messages per time.

The example should be a sketch that prints the state of a button. The state should be printed at every loop. However, the code should also verify if the time has timed out to know if the message can actually be printed. Timer should be reset each time a new message is printed.