Add Crestron AM100 PIN Brute-forcing

Crestron AM100 devices are wireless presentation displays. They can be configured with a PIN to prevent access and hijacking a session. This auxiliary module brute-forces the PIN codes.
Added a few comments to the code. Essentially, the PINs the device generates are never over 9999. So, it would be silly to ask the module to bruteforce past 9999; and that could be done by setting the MIN or the MAX to over 9999. For example, if I set MIN = 10003 and MAX = 11111, then the bruteforcing would be done entirely outside the range of possibilities.

TL/DR: No, MIN > 9999 is correct.