Add release notes for the first release

Change-Id: I210462825911fdd7eff1ee6b9db31c13dacd3c18

releasenotes/notes/bp-devstack-plugin-254fb68fdeb0fad2.yaml

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+---
+other:
+  - Introduce a Fuxi devstack plugin. This enables developers to use devstack
+    with the Fuxi devstack plugin to quickly setup the development environment.

releasenotes/notes/bp-enable-fuxi-to-use-existed-cinder-volume-bcf8da55ab5585f9.yaml

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+---
+features:
+  - |
+    Support creating Docker volumes by using existing Cinder volumes.
+    To use this feature, users need to pass the ID of an existing Cinder
+    volume when he/she creates a volume in Docker. For example,
+
+    $ docker volume create --driver fuxi --name test --opt volume_id=<id>
+
+    If a volume_id is given, Fuxi will look up the Cinder volume by the given
+    ID and use it as the created Docker volume (instead of creating a new
+    volume in Cinder).

releasenotes/notes/bp-enable-fuxi-to-use-manila-share-b7038c879400a8e3.yaml

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+---
+features:
+  - Enable Docker to use Manila (as an alternative to Cinder) to provide
+    volumes to Docker containers. Manila supports multiple back-ends and
+    share_proto. In this release, NFS share_proto is supported. The support
+    of other share_proto will be added in the future.

releasenotes/notes/bp-fullstack-testing-9cb180a31e083374.yaml

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+---
+other:
+  - Add fullstack testing and setup the CI to run the tests.

releasenotes/notes/bp-fuxi-cluster-cf26cc16e129af03.yaml

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+---
+features:
+  - Add support for cluster mode. In particular, users can create a Docker
+    volume in one node, and search it in other nodes. Before this feature
+    is implemented, each node manages its own set of volumes independently
+    and sharing volumes across different nodes in a cluster is impossible.

releasenotes/notes/cinder-volume-for-docker-69e484932e56098c.yaml

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+---
+features:
+  - Implement the Docker volume plugin API for providing Cinder volumes to
+    Docker containers. Support the usage of Docker native API to create,
+    remove, list, get, mount, and unmount Cinder volumes.