Added sample-run for tensorflow

sample-run/tensorflow/roles/docker/README.md

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+# The `docker` Role
+
+The `docker` role installs the Docker CE repository and runtime packages.
+
+This role may be executed independently by running:
+
+```bash
+$ ansible-playbook packages.yml --tags "docker"
+```
+
+On execution, this role installs the following directly to the remote machine's operating system:
+
+### Apt Repositories (Debian/Ubuntu)
+
+- Docker CE
+
+### Apt GPG Signing Keys (Debian/Ubuntu)
+
+- Docker Release (CE deb) <docker@docker.com>
+
+### Operating System Packages (Debian/Ubuntu)
+
+- docker-ce v5:18.x
+
+### System Services
+
+- `docker` (enabled and started)
+
+### User Groups
+
+- docker
+
+All users listed under `secrets.users` in `secrets.yml` will be added to the `docker` group.