Update README.md

[Adamyuanyuan]

Ensure you specify the inventory file when running the playbook if it is not located in the default path or correctly recognized by Ansible. For instance, use ansible-playbook -i your_inventory_file playbook.yaml to explicitly define the inventory.

[pan3793]

The comments are still confusing, actually, we defined inventory=hosts in the ansible.cfg, while if you have other effective ansible configurations, this one might not work.

[Adamyuanyuan]

I had to manually specify ansible-playbook -i hosts playbook.yaml for this to work, but it could also be the reason for my environment, it's a minor.