ADD - Dahua camera

Hello, I would like to add Dahua cameras. Feel free to ask anything you want.

Discovery: https://p.libren.ms/view/3d8f15a3
Poller: https://p.libren.ms/view/ef1a4697
SNMP: https://p.libren.ms/view/231760bf

I can provide the mib if you need to.
Best regards.