feat(commands): refactor and add more commands

commands/fs/mkdir.go

@@ -0,0 +1,16 @@
+package fs
+
+import (
+	"github.com/versenilvis/iris/commands/core"
+)
+
+func init() {
+	core.Register(&core.Spec{
+		Name:        "mkdir",
+		Description: "make directories",
+		Options: []core.Option{
+			{Name: "-p", Description: "create parent dirs"},
+			{Name: "-v", Description: "verbose"},
+		},
+	})
+}