[doc] Add synopsis to packages

dfssc/cmd/root.go

dfssc/common/common.go

dfssc/main.go

dfssc/sign/protocol.go

dfssd/cmd/root.go

dfssd/main.go

dfssd/server/server.go

dfssp/authority/rootCA.go

dfssp/cmd/root.go

dfssp/common/group.go

dfssp/contract/create.go

dfssp/entities/contract.go

dfssp/main.go

dfssp/server/server.go

dfssp/templates/manager.go

dfssp/user/create.go

dfsst/cmd/root.go

dfsst/entities/archivesManager.go

dfsst/main.go

dfsst/resolve/resolve.go