message: Add module-level documentation for PlaidML
diff: # You may obtain a copy of the License at
  #
  # https://www.gnu.org/licenses/agpl-3.0.en.html
  +"""
  +PlaidML
  +=======
  +A framework for making deep learning work everywhere.
  +
  +PlaidML is a multi-language acceleration framework that:
  +* Enables practitioners to deploy high-performance neural nets on any device
  +* Allows hardware developers to quickly integrate with high-level frameworks
  +* Allows framework developers to easily add support for many kinds of hardware
  +
  +For more information, see the
  +[PlaidML Announcement](http://vertex.ai/blog/announcing-plaidml),
  +and the [PlaidML GitHub Repository](https://github.com/plaidml/plaidml).
  +
  +About this module
  +-----------------
  +This module provides the low-level PlaidML Python API.
  +
  +Using this API directly requires either knowledge of the
  +[Tile](https://github.com/plaidml/plaidml/wiki/Tile-Tutorial)
  +language (used to describe the computations that make up a neural network), or
  +a pre-built serialized network (which encapsulates the Tile operations that define
  +the shape of the network, and the intra-network connection weights found by
  +training the network).
  +
  +Higher-level APIs
  +-----------------
  +plaidml.keras - Integration with the [Keras](https://keras.io/) machine learning framework.
  +This is useful for easily describing and training neural networks.
  +"""
  from __future__ import print_function
  