[Tinytag-Walnut-user] Basestation support

[Toby D. <tdi...@ge...>]

I have added a new package for supporting all things relating to digital=20
basestations; GeminiDataLoggers.Walnut.Ginko.

GeminiDataLoggers.Walnut.Ginko.Basestation contains a class which impleme=
nts=20
the digital basestation's challenge-response protocol.