Add support for Goldshell Box-series (Scrypt)

[Erikbond-git]

Currently, the Goldshell Box-series ASIC miners are not supported. Would appreciate if they get added, this seems like a nice integration!

[denbrany]

Would love to be able to control my Goldshell MD3+ via Home Assistant, hope support for this miner comes in the future. The integration looks good. Great work!