add board: esp32c3-supermini

[vaaski]

Hey, I apologize for the long silence on #4212. I just picked up the project where I need this again and thought I'd give it a shot.

I've used the xiao-esp32c3 and #4454 as a reference.

After building it, I was able to run https://github.com/tinygo-org/tinygo/blob/release/src/examples/blinky1/blinky1.go successfully.

Thanks again for all the work on tinygo and thanks to @deadprogram for the friendly and helpful responses on my original issue. I'm glad I won't have to learn C++ for my project :D

resolves #4212

[vaaski]

Not sure if this is intended design or not, but when I include a println in my blinky loop, it only blinks when there is a serial monitor attached. As soon as I stop tinygo monitor it seemingly pauses the whole loop.

package main

import (
	"machine"
	"time"
)

func main() {
	led := machine.LED
	led.Configure(machine.PinConfig{Mode: machine.PinOutput})

	for {
		println("high")
		led.High()
		time.Sleep(time.Millisecond * 1000)

		println("low")
		led.Low()
		time.Sleep(time.Millisecond * 1000)
	}
}