a matrix effect demo using switch devkitpro (libnx)

(source is configued for vscode with includePaths assuming devkitpro is installed to C:/devkitPro.)

• edit .vscode/c_cpp_properties.json for custom includePaths.
• edit .vscode/tasks.json for make and run tasks. run is configured for ME to use yuzu.

requirements:

1. devkitpro with switch-dev 'group' installed: https://devkitpro.org/wiki/Getting_Started