docs: Include example with both Firmata and API use

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/firmata_blink_api.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"time"
+
+	"github.com/hybridgroup/gobot"
+	"github.com/hybridgroup/gobot/api"
+	"github.com/hybridgroup/gobot/drivers/gpio"
+	"github.com/hybridgroup/gobot/platforms/firmata"
+)
+
+func main() {
+	gbot := gobot.NewGobot()
+
+	a := api.NewAPI(gbot)
+	a.Start()
+
+	firmataAdaptor := firmata.NewAdaptor("/dev/ttyACM0")
+	led := gpio.NewLedDriver(firmataAdaptor, "13")
+
+	work := func() {
+		gobot.Every(1*time.Second, func() {
+			led.Toggle()
+		})
+	}
+
+	robot := gobot.NewRobot("bot",
+		[]gobot.Connection{firmataAdaptor},
+		[]gobot.Device{led},
+		work,
+	)
+
+	gbot.AddRobot(robot)
+
+	gbot.Start()
+}