Adding a link to official bindings

[OfekShochat]

Hello, ghostway here from the discord. I saw there was a question on stackoverflow that pointed to this repo. Because this isnt maintained anymore (I sure hope you can keep working on this, good work!) It can confuse people. Can you add a link in the Readme to https://github.com/LeelaChessZero/lc0/tree/master/scripts/pybind? Thank you!