Update README.md add pcb to NixieTube socket connection desc

<fix>[修正Led 初始值][slight]

Merge branch 'main' of https://github.com/guomengnick/NixieTubeClock

<feat>[重構][medium]

Update README.md

Update README.md

<feat>[add english readme ][slight]

Update README.md

Update README.md

Update README.md

Create README.md

add code

add code

<fix>[將digitalRead改成analogRead][slight]

add