Add README

Author: paulbalandan

README.md

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+# CodeIgniter Coding Standard
+
+[![Unit Tests](https://github.com/CodeIgniter/coding-standard/actions/workflows/test-phpunit.yml/badge.svg)](https://github.com/CodeIgniter/coding-standard/actions/workflows/test-phpunit.yml)
+[![Coding Standards](https://github.com/CodeIgniter/coding-standard/actions/workflows/test-coding-standards.yml/badge.svg)](https://github.com/CodeIgniter/coding-standard/actions/workflows/test-coding-standards.yml)
+[![PHPStan Static Analysis](https://github.com/CodeIgniter/coding-standard/actions/workflows/test-phpstan.yml/badge.svg)](https://github.com/CodeIgniter/coding-standard/actions/workflows/test-phpstan.yml)
+[![PHPStan level](https://img.shields.io/badge/PHPStan-max%20level-brightgreen)](phpstan.neon.dist)
+[![Coverage Status](https://coveralls.io/repos/github/CodeIgniter/coding-standard/badge.svg?branch=develop)](https://coveralls.io/github/CodeIgniter/coding-standard?branch=develop)
+[![Latest Stable Version](http://poser.pugx.org/codeigniter/coding-standard/v)](https://packagist.org/packages/codeigniter/coding-standard)
+[![License](https://img.shields.io/github/license/codeigniter/coding-standard)](LICENSE)
+[![Total Downloads](http://poser.pugx.org/codeigniter/coding-standard/downloads)](https://packagist.org/packages/codeigniter/coding-standard)
+
+This library holds the official coding standards of CodeIgniter based
+on [PHP CS Fixer][1] and powered by [Nexus CS Config][2].
+
+## Installation
+
+You can add this library as a local, per-project dependency to your project
+using [Composer](https://getcomposer.org/):
+
+    composer require codeigniter/coding-standard
+
+If you only need this library during development, for instance to run your project's test suite,
+then you should add it as a development-time dependency:
+
+    composer require --dev codeigniter/coding-standard
+
+## Setup
+
+To start, let us create a `.php-cs-fixer.dist.php` file at the root of your project.
+
+```php
+<?php
+
+use CodeIgniter\CodingStandard\CodeIgniter4;
+use Nexus\CsConfig\Factory;
+
+return Factory::create(new CodeIgniter4())->forProjects();
+
+```
+
+This minimal setup will return a default instance of `PhpCsFixer\Config` containing all rules applicable
+for the CodeIgniter organization.
+
+Then, in your terminal, run the following command:
+
+```console
+$ vendor/bin/php-cs-fixer fix --verbose
+```
+
+## Adding License Headers
+
+The default setup will not configure a license header in files. License headers can be especially useful
+for library authors to assert copyright. To add license headers in your PHP files, you can simply provide
+your name and name of library. Optionally, you can also provide your email and starting license year.
+
+```diff
+ <?php
+
+ use CodeIgniter\CodingStandard\CodeIgniter4;
+ use Nexus\CsConfig\Factory;
+
+-return Factory::create(new CodeIgniter4())->forProjects();
++return Factory::create(new CodeIgniter4())->forLibrary(
++    'CodeIgniter 4 framework',
++    'CodeIgniter Foundation',
++    '[email protected]',
++    2021,
++);
+
+```
+
+## Providing Overriding Rules and Options
+
+The list of enabled rules can be found in the [`CodeIgniter\CodingStandard\CodeIgniter4`][3] class. If you
+feel the rule is not applicable to you or you want to modify it, you can do so by providing an array of
+overriding rules to the second parameter of `Factory::create()`.
+
+Similarly, you can further modify the `PhpCsFixer\Config` instance returned by using the available options.
+All available options are fully supported by [Nexus CS Config][2] and abstracted by simply providing an
+array of key-value pairs in the third parameter of `Factory::create()`.
+
+```diff
+ <?php
+
+ use CodeIgniter\CodingStandard\CodeIgniter4;
+ use Nexus\CsConfig\Factory;
+
+-return Factory::create(new CodeIgniter4())->forProjects();
++return Factory::create(new CodeIgniter4(), [], [
++    'usingCache' => false,
++])->forProjects();
+
+```
+
+You can check out this library's own [`.php-cs-fixer.dist.php`][4] for inspiration on how it is done.
+For more detailed documentation on all available options, you can check [here][2].
+
+## Contributing
+
+All forms of contributions are welcome!
+
+Since the rules here will be propagated and used within the CodeIgniter organization, all proposed rules
+and modifications to existing rules should have a proof-of-concept (POC) PR sent first to
+the [CodeIgniter4][5] repository with possible changes to the code styles applied there. Once accepted
+there, you can send in a PR here to apply those rules.
+
+## License
+
+This work is open-sourced under the MIT license.
+
+[1]: https://github.com/FriendsOfPHP/PHP-CS-Fixer
+[2]: https://github.com/NexusPHP/cs-config
+[3]: src/CodeIgniter4.php
+[4]: .php-cs-fixer.dist.php
+[5]: https://github.com/codeigniter4/CodeIgniter4