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

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

cmd/neofs-adm/main.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"os"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-adm/internal/modules"
+)
+
+func main() {
+	if err := modules.Execute(); err != nil {
+		os.Exit(1)
+	}
+}