Alibaba OSS usage docs.

docs/backends/alibaba-oss.rst

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+Alibaba OSS
+=============
+
+Alibaba Cloud Object Storage Service is compatible with the S3 protocol. To use it follow the instructions in the :doc:`Amazon S3 docs <amazon-S3>` with the important caveats that you must:
+
+- Set ``AWS_S3_ADDRESSING_STYLE`` to ``virtual`` (For security reasons, OSS supports only virtual hosted style access)
+- Set ``AWS_S3_REGION_NAME`` to your OSS region (such as ``oss-cn-shanghai`` or ``oss-cn-hangzhou``)
+- Set ``AWS_S3_ENDPOINT_URL`` to the value of ``https://${AWS_S3_REGION_NAME}.aliyuncs.com``
+- Set the values of ``AWS_ACCESS_KEY_ID`` and ``AWS_SECRET_ACCESS_KEY`` to the corresponding values from OSS
+
+Notes
+*****
+
+  Be aware Alibaba OSS are not fully compatible so there are some difference between them.
+
+- See `Use S3 API operations to access OSS after migration`_.
+- See `Compatible S3 API operations`_.
+
+.. _Use S3 API operations to access OSS after migration: https://www.alibabacloud.com/help/doc-detail/64919.htm#title-zhf-v8d-71i
+.. _Compatible S3 API operations: https://www.alibabacloud.com/help/doc-detail/64919.htm#title-cds-fai-yxp
+.. _