Added sample .env file

.env.php.sample

+<?php
+
+return array(
+
+    'APP_DEBUG'     => true,
+    'APP_URL'       => 'http://localhost',
+
+    'MYSQL_HOST'      => 'localhost',
+    'MYSQL_DATABASE'  => 'laravel',
+    'MYSQL_USERNAME'  => 'root',
+    'MYSQL_PASSWORD'  => '',
+
+);