feat: json output formatter

core/output/formatter.go

@@ -0,0 +1,12 @@
+package output
+
+import (
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+)
+
+var Formatters = map[string]interfaces.Formatter{
+	"json":  &JsonFormatter{},
+	"go":    nil,
+	"table": nil,
+	"xml":   nil,
+}