Merge pull request microsoft#89 from keith-packard/nano33iot

Add Arduino NANO 33 IoT

Author: dhalbert

boards/nano33iot/board.mk

@@ -0,0 +1,2 @@
+CHIP_FAMILY = samd21
+CHIP_VARIANT = SAMD21G18A

boards/nano33iot/board_config.h

@@ -0,0 +1,17 @@
+#ifndef BOARD_CONFIG_H
+#define BOARD_CONFIG_H
+
+#define CRYSTALLESS    1
+
+#define VENDOR_NAME "Arduino SA"
+#define PRODUCT_NAME "Arduino NANO 33 IoT"
+#define VOLUME_LABEL "NANOBOOT"
+#define INDEX_URL "https://store.arduino.cc/usa/nano-33-iot"
+#define BOARD_ID "SAMD21G18A-NANO-33"
+
+#define USB_VID 0x2341
+#define USB_PID 0x0057
+
+#define LED_PIN PIN_PA17
+
+#endif