Create ansible guide

Guides/ansible.md

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+# Ansible
+
+## Install tool
+
+`sudo apt install ansible` or with pip
+
+## Install machine
+
+The simplest way is to manually create the ansible user to serve as an entrypoint for further installation performed with Ansible :
+
+```sh
+sudo adduser jovian
+sudo usermod -aG sudo jovian
+```
+
+Then use private playbook `setup-user.yml`.
+