Add bazel module for external consumption.

BUILD.bazel

diff --git a/BUILD.bazel b/BUILD.bazel
new file mode 100644
index 0000000..0693436
--- /dev/null
+++ b/BUILD.bazel
@@ -0,0 +1,16 @@
+load("@rules_rust//rust:defs.bzl", "rust_doc_test", "rust_library", "rust_test")
+
+package(default_visibility = ["//visibility:public"])
+
+rust_library(
+    name = "ureg",
+    srcs = glob(
+        include = ["**/*.rs"],
+        allow_empty = True,
+    ),
+    crate_root = "src/lib.rs",
+    edition = "2021",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+)

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
new file mode 100644
index 0000000..33ee0a0
--- /dev/null
+++ b/MODULE.bazel
@@ -0,0 +1,3 @@
+module(name = "ureg")
+
+bazel_dep(name = "rules_rust", version = "0.56.0")