Add docs for DDOS shield

[MichaelTrestman]

https://github.com/bactensor/bt-ddos-shield/
GitHub
GitHub - bactensor/bt-ddos-shield: Protect Bittensor nodes from DDo...
Protect Bittensor nodes from DDoS attacks (without breaking the bank). - bactensor/bt-ddos-shield

They submit map, not vector and outputs dividends and incentives
When you sum these up they become emissions
The bit about trust sounds bad, as if the trustness of a validator is arbitrary
"The beauty of it is that Yuma itself figures out who is trustworthy right now and who isn't" -Rhef