chore: add go.mod

go.mod

 module gitlab.com/pimpam-games-studio/gdnative-go
 
 require (
+	github.com/alecthomas/kong v0.2.9
 	github.com/fatih/camelcase v1.0.0 // indirect
+	github.com/google/uuid v1.1.1
+	github.com/kr/pretty v0.2.0
 	github.com/magefile/mage v1.9.0
 	github.com/pinzolo/casee v0.0.0-20160729104318-956b6baf666a
 	github.com/vitaminwater/cgo.wchar v0.0.0-20160320123332-5dd6f4be3f2a