uncloud CLI tool and 'machine add' command to bootstrap a new cluster

cmd/uncloud/machine/root.go

@@ -0,0 +1,16 @@
+package machine
+
+import (
+	"github.com/spf13/cobra"
+)
+
+func NewRootCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "machine",
+		Short: "Manage machines in an Uncloud cluster.",
+	}
+	cmd.AddCommand(
+		NewAddCommand(),
+	)
+	return cmd
+}