Update readme of the project

Add the funding link and section in the readme.
Add the link to the v3 release make post in the readme.
Add the FUNDING.yml file so that we can add the funding button in the repo.
Co-authored-by: Juliette <[email protected]>

.github/FUNDING.yml

@@ -0,0 +1 @@
+custom: ["https://opencollective.com/thewpcc/contribute/wp-php-63406", WP PHP]

README.md

@@ -41,11 +41,14 @@
 * [Contributing](#contributing)
 * [License](#license)
 
+---
 
 ## Introduction
 
 This project is a collection of [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) rules (sniffs) to validate code developed for WordPress. It ensures code quality and adherence to coding conventions, especially the official [WordPress Coding Standards](https://make.wordpress.org/core/handbook/best-practices/coding-standards/).
 
+This project needs funding. If you want to donate read [here](#funding) about how you can help.
+
 ## Minimum Requirements
 
 The WordPress Coding Standards package requires:
@@ -62,7 +65,7 @@ For the best results, it is recommended to also ensure the following additional
 
 ## Installation
 
-As of WordPressCS 3.0.0, installation via Composer using the below instructions is the only supported type of installation.
+As of [WordPressCS 3.0.0](https://make.wordpress.org/core/2023/08/21/wordpresscs-3-0-0-is-now-available/), installation via Composer using the below instructions is the only supported type of installation.
 
 [Composer](https://getcomposer.org/) will automatically install the project dependencies and register the rulesets from WordPressCS and other external standards with PHP_CodeSniffer using the [Composer PHPCS plugin](https://github.com/PHPCSStandards/composer-installer).