Update README.md

README.md

@@ -1,3 +1,34 @@
-# TODO
-- Add readme, as it is always needed. Who knows who will want to use this role?
-- - At least: 1) Basic description 2) Important variables 3) Detailed info 4) Playbook example 5) Don't forget to mention other role dependencies
+Ansible role for chrony setup.
+
+This role is developed with Ansible 2.9.6 and tesed on Ubuntu 20.04 LTS.
+
+## Role Variables
+
+| Variable | Required | Default | Comments |
+| -------- | -------- | ------- | -------- |
+| `chrony_pkg_state` | No | `present` | Set pkg `enabled`, `disabled`, `latest` |
+| `chrony_service_state` | No | `started` | Set service state, started, enabled or disabled |
+| `chrony_service_enabled` | No | `yes` | A list of NTP servers to use.                   |
+| `chrony_config_server` | No | `["0.cz.pool.ntp.org","1.cz.pool.ntp.org","2.cz.pool.ntp.org", "3.cz.pool.ntp.org"]` | A list of NTP servers to use. |
+| `chrony_config_logdir` | No | `/var/log/chrony` | A list of NTP servers to use. |
+| `chrony_config_extra_options` | No | `{}` | A dict of extra config options. |
+
+## Requirements
+
+None
+
+## Install chrony with default settings
+```yaml
+  roles:
+     - ansible-chrony
+```
+
+## Install chrony with some custom variables
+```yaml
+  roles:
+     - ansible-chrony
+  vars:
+     - chrony_config_server:
+        - 0.pool.ntp.org
+        - 1.pool.ntp.org
+```