[feat] add bl702 cklink firmware

tools/cklink_firmware/README.md

@@ -0,0 +1,33 @@
+# Bouffalo CKLink
+
+This is the instructions for the cklink firmware used with BL702 or BL616.
+
+## Hardware
+
+## Sipeed RV-Debugger-Plus
+
+- Use BL702C-A0
+
+![RV-Debugger-Plus](rv-debugger.png)
+
+## Flash download
+
+- Open BL Devcube
+- Select IOT UI and select single download
+- Load firmware
+- Press and hold the boot pin then plug the usb in the computer to go to the boot mode.
+- Download
+
+![Flash download](flash_download.png)
+
+## CKLink driver
+
+CKLink driver version must be higher than 5.16.0. Download link is here.
+
+- [T-Head-DebugServer-windows-V5.16.5](https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1666331581133/T-Head-DebugServer-windows-V5.16.5-20221021-1018.zip)
+
+- [T-Head-DebugServer-linux-x86_64-V5.16.5](https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1666331533949/T-Head-DebugServer-linux-x86_64-V5.16.5-20221021.sh.tar.gz)
+
+## Debug with Eclipse
+
+See [BL_MCU_SDK DOC](https://bl-mcu-sdk.readthedocs.io/zh_CN/latest/get_started/debug.html)