CO2-Sensor MH-Z19 connected to linux UART

A simple example for using the CO2-Sensor MH-Z19 connected to linux UART.

UART must be adapted, look for variable port_names in main.zig
zig build builds exe for the compiling pc
zig build rpi builds exe for Raspberry Pi / Debian

Known features:

timezone is Europe/Berlin only

Hints: Code is under contruction and will be changed!