add at32 to README.rst, rename at32 board to lower case, correct name to match mcu, add meta data

hw/bsp/at32f403a_407/boards/at_start_f403a/board.h

@@ -24,6 +24,11 @@
  * This file is part of the TinyUSB stack.
  */
 
+/* metadata:
+   name: AT-START-F403a
+   url: https://www.arterychip.com/en/product/AT32F403.jsp
+*/
+
 #ifndef BOARD_H_
 #define BOARD_H_
 
@@ -37,6 +42,11 @@
 #define LED_STATE_ON          0 // Active Low
 #define LED_GPIO_CLK_EN()     crm_periph_clock_enable(CRM_GPIOD_PERIPH_CLOCK, TRUE)
 
+// #define LED_PORT              GPIOA
+// #define LED_PIN               GPIO_PINS_1
+// #define LED_STATE_ON          0 // Active Low
+// #define LED_GPIO_CLK_EN()     crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE)
+
 // Button
 #define BUTTON_PORT           GPIOA
 #define BUTTON_PIN            GPIO_PINS_0

hw/bsp/at32f403a_407/family.c

@@ -24,6 +24,10 @@
  * This file is part of the TinyUSB stack.
  */
 
+/* metadata:
+   manufacturer: Artery
+*/
+
 #include "at32f403a_407_clock.h"
 #include "board.h"
 #include "bsp/board_api.h"