FIX:
    1. Fix some sample code errors
    3. Fix some SDK-API errors
        a. LED example code error
        b. All example code endwith ';'

ENH:
    1. Optimized the structure of the directory
    2. Add an introduction about the extension module and extension interface
    3. Add an introduction about the demo code information
    4. Add an introduction about the version information

OTHERS:
    Thank guys(adam.guo, yzw, DeltaZero) for contributing to the guide and sample
code

    Finally, welcome to discuss any questions about RoboMaster S1/EP with us by
on GitHub