Added redirection to Apple’s tensorflow-metal PluggableDevice.

Author: Hoyt Koepke

README.md

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-## Mac-optimized TensorFlow and TensorFlow Addons
+## *You can now leverage Apple’s tensorflow-metal PluggableDevice in TensorFlow v2.5 for accelerated training on Mac GPUs directly with Metal. Learn more [here](https://developer.apple.com/metal/tensorflow-plugin/).*
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+## Mac-optimized TensorFlow and TensorFlow Addons
+
 ### INTRODUCTION
 
 This pre-release delivers hardware-accelerated TensorFlow and TensorFlow Addons for macOS 11.0+. Native hardware acceleration is supported on M1 Macs and Intel-based Macs through Apple’s [ML Compute](https://developer.apple.com/documentation/mlcompute) framework.