Add README

Author: mnasiadka

README.md

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+# StackHPC cephadm collection
+
+This repo contains `stackhpc.cephadm` Ansible Collection. The collection includes modules and plugins supported by StackHPC for cephadm based deployments.
+
+## Tested with Ansible
+
+Tested with the current Ansible 2.9 releases.
+
+## Included content
+
+cephadm_deploy role
+
+## Using this collection
+
+Before using the collection, you need to install the collection with the `ansible-galaxy` CLI:
+
+    ansible-galaxy collection install stackhpc.cephadm
+
+You can also include it in a `requirements.yml` file and install it via ansible-galax collection install -r requirements.yml` using the format:
+
+```yaml
+collections:
+- name: stackhpc.cephadm
+```
+
+See [Ansible Using collections](https://docs.ansible.com/ansible/latest/user_guide/collections_using.html) for more details.
+
+## More information
+
+- [Ansible Collection overview](https://github.com/ansible-collections/overview)
+- [Ansible User guide](https://docs.ansible.com/ansible/latest/user_guide/index.html)
+- [Ansible Developer guide](https://docs.ansible.com/ansible/latest/dev_guide/index.html)
+- [Ansible Community code of conduct](https://docs.ansible.com/ansible/latest/community/code_of_conduct.html)
+
+## Licensing
+
+Apache License Version 2.0