[#666] cmd/neofs-adm: Initial app structure with config init command

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

cmd/neofs-adm/internal/modules/config/root.go

@@ -0,0 +1,29 @@
+package config
+
+import (
+	"github.com/spf13/cobra"
+)
+
+const configPathFlag = "path"
+
+var (
+	// RootCmd is a root command of config section.
+	RootCmd = &cobra.Command{
+		Use:   "config",
+		Short: "Section for neofs-adm config related commands.",
+	}
+
+	initCmd = &cobra.Command{
+		Use:   "init",
+		Short: "Initialize basic neofs-adm configuration file.",
+		Example: `neofs-adm config init
+neofs-adm config init --path .config/neofs-adm.yml`,
+		RunE: initConfig,
+	}
+)
+
+func init() {
+	RootCmd.AddCommand(initCmd)
+
+	initCmd.Flags().String(configPathFlag, "", "path to config (default ~/.neofs/adm/config.yml)")
+}