Sensirion Sht4x Support (#597)

sht4x: implemented driver

examples/sht4x/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/sht4x"
+)
+
+func main() {
+	machine.I2C0.Configure(machine.I2CConfig{})
+	sensor := sht4x.New(machine.I2C0)
+
+	for {
+		temp, humidity, _ := sensor.ReadTemperatureHumidity()
+		t := fmt.Sprintf("%.2f", float32(temp)/1000)
+		h := fmt.Sprintf("%.2f", float32(humidity)/100)
+		println("Temperature: ", t, "°C")
+		println("Humidity:    ", h, "%")
+		time.Sleep(2 * time.Second)
+	}
+}