Add example for matrix keypad read from BitDogLab #24
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This is a portability to BitDogLab for example "Read Matrix Keypad" showed in Unit 4, Chapter 2 from Embarcatech course. The main text is based on the ebook "Práticas de Portas de Entrada e Saída - GPIO" written by Tiago Façanha. Therefore, my main goal was to adapt the code and diagrams to BitDogLab schematics.