Resolve #3452289 "Add step by step documentation"

Closes #3452289

README.md

-
 # CloudFront Cache Path Invalidate
 
-Cloudfront Cache Path Invalidate module, you can manage the cache clear of
-Amazon Cloudfront through a setting form.
+Manage cache clearing in Amazon CloudFront through Drupal settings.
 
-For a full description of the module, visit the
-[project page](https://www.drupal.org/project/cloudfront_cache_path_invalidate).
+For a detailed description and updates, visit the [project page](https://www.drupal.org/project/cloudfront_cache_path_invalidate).
 
-Submit bug reports and feature suggestions, or track changes in the
-[issue queue](https://www.drupal.org/project/issues/cloudfront_cache_path_invalidate).
+Submit bug reports, feature suggestions, or track changes in the [issue queue](https://www.drupal.org/project/issues/cloudfront_cache_path_invalidate).
 
-## Table of contents
+## Table of Contents
 
-- Requirements
-- Installation
-- Configuration
-- Maintainers
+- [Requirements](#requirements)
+- [Installation](#installation)
+- [Configuration](#configuration)
+- [Maintainers](#maintainers)
 
 ## Requirements
 
-This module requires the following :
 - Drupal 10.x
-- CloudFront Setup
-    AWS Distribution ID
-    AWS Access Key
-    AWS Secret Key
-    AWS Region
+- AWS Setup:
+  - AWS Distribution ID
+  - AWS Access Key
+  - AWS Secret Key
+  - AWS Region
 
 ## Installation
 
-Install the CloudFront Cache Path Invalidate:
-Download it from [CloudFront Cache Path Invalidate](https://www.drupal.org/project/cloudfront_cache_path_invalidate) and install it on your website.
-
-- With Composer
-  `$ composer require 'drupal/cloudfront_cache_path_invalidate'`
+Install the module:
+- **Manual Download:** Download from [CloudFront Cache Path Invalidate](https://www.drupal.org/project/cloudfront_cache_path_invalidate) and install on your website.
+- **Using Composer:**
+  ```sh
+  $ composer require 'drupal/cloudfront_cache_path_invalidate'
+  ```
 
 ## Configuration
-This needs the following settings:
-Please use below $settings with your AWS Credential in settings.php file
 
-$settings['aws.distributionid'] = '';
-$settings['aws.region'] = '';
-$settings['s3fs.access_key'] = '';
-$settings['s3fs.secret_key'] = '';
+1. **AWS Credentials:**
+   Add AWS credentials to `settings.php` or `settings.local.php`:
+   ```php
+   $settings['aws.distributionid'] = ''; // Example: 'ABCD1234EFGH7'
+   $settings['aws.region'] = ''; // Example: 'eu-west-2'
+   $settings['aws.access_key'] = ''; // Example: 'AKIAIOSFODNN7EXAMPLE'
+   $settings['aws.secret_key'] = ''; // Example: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY'
+   ```
+   Generate these from AWS IAM. See [AWS IAM User Guide](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_access-keys.html).
+
+2. **Configure Behavior:**
+   - Go to `/admin/config/services/auto-cloudfront-cache-entities`.
+   - Select entity type and bundle to trigger invalidation (e.g., "Content type" -> "Article").
+   - Toggle "Detail page" to invalidate paths on updates.
+   - Add additional paths to invalidate in "Cloudfront URL to invalidate".
+
+3. **Test Behavior:**
+   Edit and save a "Page" node to trigger cache invalidation for its paths.
+
+4. **Check Logs:**
+   Verify cache clearing in recent log messages:
+   ```
+   Cloudfront Auto Cache Flush on Update entity_type: node_type bundle_type: article bundle: node entity_id: 123 and paths /articles, /articles/my-latest-updated-article
+   ```
 
 ## Maintainers
-- Prashant Mishra - [PrashantMishra](https://www.drupal.org/u/prashant-mishra)
\ No newline at end of file
+
+- Prashant Mishra - [PrashantMishra](https://www.drupal.org/u/prashant-mishra)