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

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