add README.md file to project hmi_sdk
add README.md file to project hmi_sdk

APCVSRepo/hmi_sdk,smartdevice475/hmi_sdk,APCVSRepo/hmi_sdk,APCVSRepo/hmi_sdk,smartdevice475/hmi_sdk,smartdevice475/hmi_sdk,APCVSRepo/hmi_sdk,APCVSRepo/hmi_sdk,APCVSRepo/hmi_sdk,smartdevice475/hmi_sdk,smartdevice475/hmi_sdk,smartdevice475/hmi_sdk,APCVSRepo/hmi_sdk,smartdevice475/hmi_sdk