contrib: import system containers

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

contrib/system_containers/fedora/README.md

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+# cri-o
+
+This is the cri-o daemon as a system container.
+
+## Building the image from source:
+
+```
+# git clone https://github.com/projectatomic/atomic-system-containers
+# cd atomic-system-containers/cri-o
+# docker build -t crio .
+```
+
+## Running the system container, with the atomic CLI:
+
+Pull from registry into ostree:
+
+```
+# atomic pull --storage ostree $REGISTRY/crio
+```
+
+Or alternatively, pull from local docker:
+
+```
+# atomic pull --storage ostree docker:crio:latest
+```
+
+Install the container:
+
+Currently we recommend using --system-package=no to avoid having rpmbuild create an rpm file
+during installation. This flag will tell the atomic CLI to fall back to copying files to the
+host instead.
+
+```
+# atomic install --system --system-package=no --name=crio ($REGISTRY)/crio
+```
+
+Start as a systemd service:
+
+```
+# systemctl start crio
+```
+
+Stopping the service
+
+```
+# systemctl stop crio
+```
+
+Removing the container
+
+```
+# atomic uninstall crio
+```