Added README.md file

README.md

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+# docker playbook
+
+## Introduction
+
+This is the top level playbook for the 'docker' role, and will install docker
+on the target host.
+
+The username of the user that will be running the docker command is supplied
+so that that user can be added to the appropriate groups.
+
+This playbook can be run using the following command line;
+
+    ansible-playbook -i <inventory file | IP,> -e "username=<username>" docker.yml
+
+    ie,
+    ansible-playbook -i 192.168.0.101, -e "username=ubuntu" docker.yml
+