If you are not familiar with modules, check out Ansible - Getting Started with Modules.

The file module with state: directory is used to create a directory. In this example, the /tmp/example directory will be created if it does not exist.

---
- hosts: localhost
  tasks:
  - name: mkdir /tmp/example
    ansible.builtin.file:
      path: /tmp/example
      state: directory
...

Directory created

If the directory was successfully created, the play should indicate changed.

TASK [mkdir /tmp/example]
changed: [localhost]

Directory not created

If the directory was not created, the play should indicate ok. This is the expected behavior if the directory already exists. If the directory already exists, the directory will not be created, overwritten, or changed.

TASK [mkdir /tmp/example]
ok: [server1.example.com]

Owner / Group / Mode

When the owner, group or mode options are used, if the directory already exists, the directory will be updated with the owner, group and mode.

- name: update /tmp/example owner group mode
  file:
    path: /tmp/example
    state: directory
    owner: john.doe
    group: admins
    mode: "0770"

You may also want to use x.stat.exists to determine if the directory exists, and x.stat.isdir to determine if the object is a directory.