Some updates

src/SmsGateway/Sender/GnokiiSender.php

@@ -5,4 +5,18 @@ use SmsGateway\SenderInterface;
 
 class GnokiiSender implements SenderInterface
 {
-}
+    private $gnokiiPath;
+
+    public function __construct($gnokiiPath)
+    {
+        $this->gnokiiPath = $gnokiiPath;
+
+        if (!is_executable($this->gnokiiPath)) {
+            throw new \Exception('Specified Gnokii executable is not executable by me!');
+    }
+
+    public function send($recipient, $message)
+    {
+        return true;
+    }
+}