fgm/go_tooling: Misc Go tools @ 2f6f2fc38d0fff86b453721d35798b40036c7591

Frederic G. MARAND 2b9a3fdb3a httprouter demo		%!s(int64=5) %!d(string=hai) anos
..
.gitignore	2b9a3fdb3a httprouter demo	%!s(int64=5) %!d(string=hai) anos
go.mod	2b9a3fdb3a httprouter demo	%!s(int64=5) %!d(string=hai) anos
go.sum	2b9a3fdb3a httprouter demo	%!s(int64=5) %!d(string=hai) anos
httprouter.go	2b9a3fdb3a httprouter demo	%!s(int64=5) %!d(string=hai) anos