Changes to build gyroscope_mouse

1.Add porject of example\gyroscope_mouse

2.Edit platformio.ini and set default_envs with gyroscope_mouse, like:

[platformio]
default_envs = gyroscope_mouse

3.build and Upload

Changes to build M5StickCPlus2-UserDemo

M5StickCPlus2 user demo for hardware evaluation.

1.Add porject of example\userdemo

2.Edit platformio.ini and set default_envs with userdemo, like:

[platformio]
default_envs = userdemo

3.build and Upload