Add a bzl_library incase something needs it from here.

RELNOTES: None.
PiperOrigin-RevId: 241996984

BUILD

diff --git a/BUILD b/BUILD
index 731d0f2..2089c7f 100644
--- a/BUILD
+++ b/BUILD
@@ -1,7 +1,21 @@
+load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
+
 licenses(["notice"])
 
 exports_files(["LICENSE"])
 
+# A bzl_library incase anything needs to depend on this for other libraries
+# (like to then use stardoc).
+bzl_library(
+    name = "bzl_library",
+    srcs = glob(["*.bzl"]),
+    visibility = ["//visibility:public"],
+    deps = [
+        "//lib:bzl_library",
+        "//rules:bzl_library",
+    ],
+)
+
 # Consumed by bazel tests.
 filegroup(
     name = "for_bazel_tests",