Create BUILD.bazel
diff --git a/platform_data/BUILD.bazel b/platform_data/BUILD.bazel
new file mode 100644
index 0000000..94ececc
--- /dev/null
+++ b/platform_data/BUILD.bazel
@@ -0,0 +1,3 @@
+exports_files([
+    "defs.bzl",
+])