simon/pragprog.com: Powerful Command line applications @ main

simon 583c5508c4 adding another step to the pipline		8 月之前
..
testdata	583c5508c4 adding another step to the pipline	8 月之前
errors.go	8000a6530b initial version for GoCi	9 月之前
exceptionSetp.go	583c5508c4 adding another step to the pipline	8 月之前
go.mod	8000a6530b initial version for GoCi	9 月之前
main.go	583c5508c4 adding another step to the pipline	8 月之前
main_test.go	583c5508c4 adding another step to the pipline	8 月之前
step.go	45889e2f15 fix: refact goci, define a pipline	9 月之前