initially support compose v2 format, and close #8 as well

cli/command/command.go

@@ -75,6 +75,10 @@ func ConvertCommand() cli.Command {
 				Name:  "from-bundles",
 				Usage: "Getting input from docker DAB file",
 			},
+			cli.BoolFlag{
+				Name:  "from-compose-v2",
+				Usage: "Getting input from docker compose file version 2",
+			},
 		},
 	}
 }