Merge "Create a simple README for bazel darwin prebuilts." am: 59048da6cd am: aa6513f98d am: 11b27bcbac

Original change: https://android-review.googlesource.com/c/platform/prebuilts/bazel/darwin-x86_64/+/1622682

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Iea25cc6ae32b4be3c6d988389c920e79a3c61577
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+## Updating the Bazel darwin/macOS prebuilts
+
+Refer to the [linux-x86_64 README](../linux-x86_64/README.md) for instructions to update both the linux and
+darwin Bazel binaries together.