SLC V2 Alpha release

RPI3

Merge branch 'RPI3'

RPI 4 + arduino with usb serial communication

2.0 version RPI 4 run one Tomcet10 server with Spring boot 3.0.0 (api server) and one Arduino uno.

Web api control get request:

/on =led on

/off =led off

/measurement =light measurement

/brightness?level={int} =sett brightness (0-255)

/color?r={int}&g={int}&b={int} =set color (0-255)

//color/brightness?level={int} =set color brightness (0-100)

Arduino_uno_NX_display_nepoixel_led_automazic_on_off 2.0

Update README.md