Start work on width testing kitten

tools/cli/wcswidth_kitten.go

@@ -0,0 +1,25 @@
+package cli
+
+import (
+	"fmt"
+)
+
+var _ = fmt.Print
+
+func main() (rc int, err error) {
+	return
+}
+
+func WcswidthKittenEntryPoint(root *Command) {
+	root.AddSubCommand(&Command{
+		Name:            "__width_test__",
+		Hidden:          true,
+		OnlyArgsAllowed: true,
+		Run: func(cmd *Command, args []string) (rc int, err error) {
+			if len(args) != 0 {
+				return 1, fmt.Errorf("Usage: __width_test__")
+			}
+			return main()
+		},
+	})
+}