Add stable image list to README.md
Add stable image list to README.md

Add a list of stable ceph-container daemon images.
Should resolve #1085

Signed-off-by: Elias Abacioglu <bccc3558a314c723ff8bb9bf038f5707a5cbc3a7@gmail.com>
JrCs/ceph-docker,JrCs/ceph-docker,JrCs/ceph-docker