update readme

Author: F. Michel

README.md

@@ -1 +1,26 @@
 # php-dotenv
+# Loads environment variables from .env file to getenv(), $_ENV and $_SERVER.
+
+```
+APP_ENV=dev
+DATABASE_DNS=mysql:host=localhost;dbname=test;
+DATABASE_USER=root
+DATABASE_PASSWORD=root
+```
+
+
+```
+**How to use ?**
+```php
+<?php
+use DevCoder\DotEnv;
+
+(new DotEnv(__DIR__ . '/.env'))->load();
+
+echo getenv('APP_ENV');
+// dev
+echo getenv('DATABASE_DNS')
+// mysql:host=localhost;dbname=test;
+```
+Ideal for small project
+Simple and easy!