Add README

README.md

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+### Usage
+
+Open your project or initialize a new one with this composer.json:
+
+```json
+{
+    "name": "acme/my-project",
+    "description": "My project",
+    "repositories":[
+        {
+            "type":"composer",
+            "url":"https://packages.destrier.tk",
+            "only": [
+                "oreolek/payeer"
+            ]
+        }
+    ],
+    "minimum-stability": "dev"
+}
+```
+
+(The `repositories` value is the key here.)
+
+Type `composer require oreolek/payeer`
+
+If you don't have a PSR-7 implementation in your project, composer will stop and give you a choice. You can repeat the command with your choice, like this:
+
+```
+composer require oreolek/payeer php-http/guzzle7-adapter
+```
+
+Initialize the Payeer\Adapter with your ID and secret key:
+
+```php
+$adapter = new Adapter([
+  'id' => $_ENV['PAYEER_ID'],
+  'key' => $_ENV['SECRET'],
+]);
+```
+
+(see `test/PayeerTest.php` for example)
+
+You can use any method, it is transparently sent to the API as is:
+
+```php
+$response = $adapter->time();
+```