[44net] Uncomplicated Firewall for AMPR installs

I wrote another doc. This time it is on the Uncomplicated Firewall package that comes shipped as default in all Debian based Linux distro's including Ubuntu, Raspian and Debian itself. It is NOT meant to be a full "UFW Operators Guide" but simply a few pointers to get your systems secured and keep out the great unwashed. I do not grant permission to anyone other than ARDC to "host" this or any of my documents on their system, website or document archive. From time to time this document may be updated by me and posted where relevant. My work should NOT be considered "public domain". See attached. Mark / NI2O