Add support for HTS221 capacitive digital sensor for relative humidity and temperature (#295)

hts221: Add support for hts221.go

hts221/hts221_generic.go

@@ -0,0 +1,13 @@
+// +build !nano_33_ble
+
+package hts221
+
+import "tinygo.org/x/drivers"
+
+// New creates a new HTS221 connection. The I2C bus must already be
+// configured.
+//
+// This function only creates the Device object, it does not touch the device.
+func New(bus drivers.I2C) Device {
+	return Device{bus: bus, Address: HTS221_ADDRESS}
+}