Add sutil CLI in cmd/sutil with internal/cli command tree

cmd/sutil/main.go

@@ -0,0 +1,20 @@
+// Command sutil is sneak's shell utility: small tools backed by the
+// packages in sneak.berlin/go/x. Run `sutil --help` for the command list.
+package main
+
+import (
+	"os"
+
+	"sneak.berlin/go/x/internal/cli"
+)
+
+// version is the build version. The Makefile and Dockerfile set it at link
+// time with -ldflags "-X main.version=...".
+var version = "dev"
+
+func main() {
+	err := cli.New(cli.Params{Version: version}).Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}