Merge pull request #4 from szepeviktor/patch-1

Enhance README

Author: iamgergo

README.md

@@ -2,8 +2,25 @@
 
 This provides an OpenAPI schema and an auto-generated PHP client as a composer package.
 
-> Note: This is not an official package.
+> [!NOTE]  
+> This is not an official package.
+
+## Requirements
+
+- PHP 8.1+
+- Curl, JSON, Multibyte String extensions
 
 ## Installation
 
+- Composer
+- Manual
+
+## Configuration
+
+- SimplePay API key
+
 ## Usage
+
+```php
+$client = new Cone\SimplePay\Client(...
+```