ec1000-bsp README

if serial do not work,please send command: " cd .vscode-oss/extensions/hancel.serialport-helper-0.0.15/node_modules/@serialport/bindings node-gyp rebuild --target=18.3.5 --arch=x64 --dist-url=https://electronjs.org/headers cd ../../usb-detection/ node-gyp rebuild --target=18.3.5 --arch=x64 --dist-url=https://electronjs.org/headers " if show error, please install vs2022 follow the worings