Add new example - follow

Minimal PRU example that reads the logic level on input pin GPIO1_16/P8_16
(pr1_pru0_pru_r31_14), and sets output pin GPIO1_12/P8_12 (pr1_pru0_pru_r30_14)
to the same level
Add new example - timer

Minimal PRU example that sets a recurring timer, and writes an incrementing
value to data memory where it can be read by the main processor.
Remove unnecessary code (famous last words)