Provide install command

[egobude]

Creates a default docker-compose file like:

cat ${HENRI_TEMPLATES}/common-base.yml | \
    sed -e "s#{{ IMAGE_ELASTICSEARCH }}#${IMAGE_ELASTICSEARCH}#g" | \
    sed -e "s#{{ IMAGE_MARIADB }}#${IMAGE_MARIADB}#g" | \
    sed -e "s#{{ IMAGE_NGINX }}#${IMAGE_NGINX}#g" | \
    sed -e "s#{{ IMAGE_PHP }}#${IMAGE_PHP}#g" | \
    sed -e "s#{{ IMAGE_REDIS }}#${IMAGE_REDIS}#g" \
    > $(pwd)/common-base.yml

cat ${HENRI_TEMPLATES}/docker-compose.yml | \
    sed -e "s#{{ VIRTUAL_HOST }}#${DOMAIN}#g" \
    > $(pwd)/docker-compose.yml