Protect admin pages

Change-Id: I09e77bf11424c7dbad22f925f2563138a5f9c563
diff --git a/credentials.sample.php b/credentials.sample.php
index a82816e..7bd7010 100644
--- a/credentials.sample.php
+++ b/credentials.sample.php
@@ -7,4 +7,5 @@
   public $dbname = "pastanaga";
   public $usersdb = "pastanaga";
   public $mortsdb = "pastanaga_morts";
+  public $adminToken = "longRandomStringForTheAdminPages";
 };