Add README

README.md

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+# poc-ceph
+
+This is a proof-of-concept installation of Ceph using 3 MONs and 3 OSDs.
+It uses the [manual installation](https://docs.ceph.com/en/reef/install/index_manual/) using Ansible.
+
+## Getting started
+
+1. Adjust the CPU/RAM provisioned for each machine in the `Vagrantfile` according to your system.
+   This is a 6-machine setup that can easily eat up all your ressources.
+2. Start the machines and write the SSH config used by Ansible:
+```bash
+$ vagrant up && vagrant ssh-config > ssh_config
+```
+3. Launch the installation:
+```bash
+$ ansible-playbook playbook.yml
+```
+
+## Reference
+
+- [https://docs.ceph.com/en/reef/](https://docs.ceph.com/en/reef/)