update doc

Author: caolei

README.md

@@ -8,6 +8,8 @@ Open cmsis pack and add device info to JLink, used to support JLink flasher
 
 - Install python36 x64
 
+- Execute `./setup.sh` install dependences
+
 - Execute `jlink-device-addon -x <JLinkDevices.xml path> <your cmsis pack path>` 
 
 - And then the device info list will be add to your `JLinkDevices.xml`