docs: add readme

[sbaerlocher]

Changed

• Enhanced Documentation in Environment Role:

  • Environment Role README Update (roles/environment/README.md):
    • Updated the README to include a link to the Arillso System Guide for detailed information and advanced usage. This change aims to provide users with a direct reference to comprehensive documentation.

• New MOTD Role Documentation:

  • MOTD Role README Added (roles/motd/README.md):

    • Introduced a new README for the MOTD (Message of the Day) role. This documentation covers requirements, role variables, dependencies, and includes an example playbook. It serves as a guide for managing MOTD configuration, including creation, modification, and deletion of MOTD content on systems.

    • Highlights include:

      • Requirements: Specifies the minimum Ansible version and access rights needed.
      • Role Variables: Describes variables for customizing the MOTD, such as header text, FQDN, operating system distribution, virtualization details, and more.
      • Dependencies: Clarifies that the role is standalone and does not require other roles.
      • Documentation Link: Provides a link to the Arillso System Guide for further details and advanced usage.
      • Example Playbook: Offers an example playbook demonstrating how to use the arillso.system.motd role with custom variables.