Add information for 3B+ Model

[rishacha]

I was able to able to get the OK01module up and running for Pi 3B+ by going through the manual.

I got to know through an online post about the GPIO Pin for Activity LED being 29.

Can I contribute and add the necessary snippets?

[ExileInParadise]

Please do - either in comments or through a github pull request.

[floese]

I was able to able to get the OK01module up and running for Pi 3B+ by going through the manual.

I got to know through an online post about the GPIO Pin for Activity LED being 29.

I'd love to see your code adapted for Pi 3B+. Can I see it somewhere?