Dockerhub description of saio image

Change-Id: Ifcb5013a5728d93cf5491fbff81b2677450698e6

docker/dockerhub_description.md

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+# SAIO (Swift All in One)
+
+SAIO is a containerized instance of Openstack Swift object storage. It is
+running the main services of Swift, designed to provide an endpoint for
+application developers to test against both the Swift and AWS S3 API. It can
+also be used when integrating with a CI/CD system. These images are not
+configured to provide data durability and are not intended for production use.
+
+
+# Quickstart
+
+```
+docker pull openstackswift/saio
+docker run -d -p 8080:8080 openstackswift/saio
+```
+
+### Test against Swift API:
+
+Example using swift client to target endpoint:
+```
+swift -A http://127.0.0.1:8080/auth/v1.0 -U test:tester -K testing stat
+```
+
+### Test against S3 API:
+
+Example using s3cmd to test AWS S3:
+
+1. Create config file:
+```
+[default]
+access_key = test:tester
+secret_key = testing
+host_base = localhost:8080
+host_bucket = localhost:8080
+use_https = False
+```
+
+2. Test with s3cmd:
+```
+s3cmd -c s3cfg_saio mb s3://bucket
+```
+
+# Quick Reference
+
+- **Image tags**: `latest` automatically built/published by Zuul, follows
+   master branch. Releases are also tagged in case you want to test against
+   a specific release.
+- **Source Code**: github.com/openstack/swift
+- **Maintained by**: Openstack Swift community
+- **Feedback/Questions**: #openstack-swift on freenode