Readme-Update (#1)

* Filled out the Readme with a little description and examples

* edit readme

* Revert "edit readme"

This reverts commit 6aa9b4d.

* edit readme #2

README.md

@@ -1,2 +1,54 @@
 # EnvReader
-PHP Environment Reader
+### PHP Environment Reader
+
+Simple Environment Reader which can parse the Value to a specific type. It tries to find the Value in $_ENV, $_SERVER and via getenv. The logic is leaned on the [EnvVarProcessor](https://github.com/symfony/symfony/blob/6.2/src/Symfony/Component/DependencyInjection/EnvVarProcessor.php) from Symfony.
+
+Actual included Types are:
+
+- integer
+- float
+- string
+- boolean
+
+You can add your own Type by creating a class which implements the TypeInterface.
+
+Example:
+```php
+<?php
+
+declare(strict_types=1);
+
+namespace Company\EnvTypes;
+
+use Freesoftde\EnvReader\Types\TypeInterface;
+
+class CustomType implements TypeInterface
+{
+    public function getName(): string
+    {
+        return 'custom';
+    }
+
+    public function convert(string $value): mixed
+    {
+        // convert the value to custom type
+        return $value;
+    }
+}
+```
+
+Usage of the CustomType:
+
+```php
+<?php
+
+use Company\EnvTypes\CustomType;
+
+$env = Env::getInstance();
+// add custom type
+$env->getCollection()->addItem(new CustomType());
+
+// read Env
+$var = $env->get('FOO', 'custom_type');
+
+```