create UI library

[cntlsn]

create a library (or edit LDisplay library) to use functions in

• https://github.com/Seeed-Studio/Arduino_IDE_for_RePhone/blob/master/hardware/arduino/mtk/system/libmtk/include/vmgraphic.h
• https://github.com/Seeed-Studio/Arduino_IDE_for_RePhone/blob/master/hardware/arduino/mtk/system/libmtk/include/vmgraphic_image.h
• https://github.com/Seeed-Studio/Arduino_IDE_for_RePhone/blob/master/hardware/arduino/mtk/system/libmtk/include/vmgraphic_font.h