message: Add link to usage guide of Alibaba Cloud OSS support
diff: @@ -20,6 +20,7 @@ At the moment TensorFlow I/O supports the following data sources:
  - `tensorflow_io.lmdb`: LMDB file format support.
  - `tensorflow_io.mnist`: MNIST file format support.
  - `tensorflow_io.pubsub`: Google Cloud Pub/Sub support.
  +- `tensorflow_io.oss`: Alibaba Cloud Object Storage Service (OSS) support. Usage guide [here](https://github.com/tensorflow/io/blob/master/tensorflow_io/oss/README.md).
  ## Installation
  