✨ [sw] add assembly-only demo program #436
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Add a new simple assembly-only demo program derived from
sw/example/demo_blink_led.Implements a simple counter that uses the lowest 8 bits of the GPIO's output port (increments every 0.25s). The CPU cycle counter is used as time base. Hence, this program requires the GPIO controller and the CPU Zicsr and Zicnt ISA extensions.