Migrate files form the legacy doc-guidelines

Those were migrated as is as they are still up to date.

ANSIBLE.md

@@ -0,0 +1,103 @@
+# Ansible guidelines
+
+- [Naming convention](#naming-convention)
+- [Linting](#linting)
+- [Formatting](#formatting)
+- [Role vs Tasks](#role-vs-tasks)
+- [Repository Structure](#repository-structure)
+  - [Collection](#collection)
+
+## Naming convention
+
+File, directory and variable names MUST be `snake_case`. Only use `yaml` files and use `*.yml` extension.
+
+## Linting
+
+Code should pass linting
+
+```bash
+ansible-lint
+```
+
+## Formatting
+
+Code should be formatted as follow:
+
+- Use space instead of tab
+- Use 2 spaces indentation
+- YAML files should always start with `---` and end with a blank line
+
+    ```yaml
+    ---
+    # This is an example of correct yaml file formatted
+    my_yaml:
+      content: hello world
+
+    ```
+
+You should always use the formatting tool of ansible-lint
+
+```bash
+ansible-lint --write all
+```
+
+## Role vs Tasks
+
+For reusable code prefer Roles over Tasks. If some code could reused than encapsulate it in a role,
+otherwise simply add it to your playbook.
+
+## Repository Structure
+
+Repository should be prefixed by; `infra-ansible-`
+
+And they should follow this structure
+
+```text
+├── files
+│   └── some-file.txt
+├── group_vars
+│   └── group_name.yml
+├── hosts_vars
+│   └── host_name.yml
+├── roles
+│   └── my_role
+│       ├── handlers
+│       │   └── main.yml
+│       ├── defaults
+│       │   └── main.yml
+│       ├── files
+│       │   └── some-file.txt
+│       ├── tasks
+│       │   └── main.yml
+│       ├── vars
+│       │   └── main.yml
+│       └── README.md
+├── vars
+│   └── main.yml
+├── playbook_1.yml
+├── playbook_2.yml
+└── inventory.yml
+```
+
+### Collection
+
+For collection we follow the ansible standard folder structure
+
+```text
+├── roles
+│   └── bgdi_toolchains
+│       ├── handlers
+│       ├── defaults
+│       ├── files
+│       ├── tasks
+│       │   └── main.yml
+│       ├── vars
+│       └── README.md
+├── playbooks
+|   ├── files
+|   ├── vars
+|   ├── templates
+│   └── my-playbook.yml
+├── galaxy.yml
+└── README.md
+```