add WiringPi installation instructions #19
Description
WiringPi library isn't included in PiOS lite (March 4th 2021 release, at the time of writing); it wasn't obvious it needed to be installed, following the Installation chapter.
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WiringPi library isn't included in PiOS lite (March 4th 2021 release, at the time of writing); it wasn't obvious it needed to be installed, following the Installation chapter.