Update README.md

README.md

@@ -21,6 +21,8 @@ BLE_MOSI  - SPI1_MOSI   - PA7
 BLE_IRQ   - GPIO_EXTI0  - PA0
 BLE_CS    - GPIO_Output - PA1
 BLE_Reset - GPIO_Output - PA8
+            USART2_TX   - PA2
+            USART2_RX   - PA3
 ```
 Go to additional software and on the STMicroelectronics.X-CUBE-BLE1 select the Wireless_BlueNRG-MS list and put the following options.
 ```