update README.md

Author: is-qian

README.md

@@ -5,6 +5,8 @@ This repository contains the Arduino BSP for Seeed nRF52 series:
 - [Seeed Studio XIAO nRF52840](https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html)
 - [Seeed Studio XIAO nRF52840 Sense](https://www.seeedstudio.com/Seeed-XIAO-BLE-Sense-nRF52840-p-5253.html)
 - [Seeed Studio Wio Tracker 1110](https://www.seeedstudio.com/Wio-Tracker-1110-Dev-Board-p-5799.html)
+- [Seeed Studio XIAO nRF52840 Plus](https://www.seeedstudio.com/Seeed-Studio-XIAO-nRF52840-Plus-p-6359.html)
+- [Seeed Studio XIAO nRF52840 Sense Plus](https://www.seeedstudio.com/Seeed-Studio-XIAO-nRF52840-Sense-Plus-p-6360.html)
 
 ## BSP Installation