chore add licenses

Makefile

api.go

api_test.go

command.go

command_test.go

doc.go

error.go

error_test.go

execute.go

execute_test.go

flag.go

flag_test.go

integration_test.go

parse.go

pathfind.go

pathfind_test.go

readme_test.go

setting.go

setting_test.go

shadow.go