Create README.md

Author: aab-odoo

README.md

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+About this Repo
+======
+
+This is the Git repo of the official Docker image for [Odoo](https://registry.hub.docker.com/_/odoo/). See the Hub page for the full readme on how to use the Docker image and for information regarding contributing and issues.
+
+The full readme is generated over in [docker-library/docs](https://github.com/docker-library/docs), specifically in [docker-library/docs/odoo](https://github.com/docker-library/docs/tree/master/odoo).