Delegated Proof of State example

DPoS minimum 4 delegate for consensus algorithm

How to start?
$ go build main.go
$ ./main 3000
$ open new terminal, cp blockchain_3000.db blockchain_3001.db, ./main 3001
$ open new terminal, cp blockchain_3000.db blockchain_3002.db, ./main 3002
$ open new terminal, cp blockchain_3000.db blockchain_3003.db, ./main 3003